Table 1 The physicochemical, elemental and spectral characteristics of synthesized thiazolidine-2,4-dione derivatives

5-((E)-4-((E)-(phenylimino)methyl)benzylidene)thiazolidine-2,4-dione: m.p. °C: 260-262; Rf value: 0.60^b; % yield: 80; IR (KBr pellets) cm⁻¹: 3375.41 (N–H str., thiazolidine ring), 1742.41 (C=O str., thiazolidin-2,4-dione ring), 1696.11 (C=N str., imine group), 1414.1 (C=C str., aromatic ring), 1602.13 (C=C str., methylene group), 3044.78 (C–H str., aromatic ring), 2919.12 (C–H str., aliphatic), 1317.75 (C–N str., thiazolidine ring), 614.77 (C–S bend., thiazolidine ring); ¹H-NMR (δ, DMSO): 6.52–7.75 (m, 9H, Ar–H), 7.77 (s, 1H, –CH=), 8.71(s, 1H, CH=N), 12.49 (s, 1H, NH); M. Formula: C₁₇H₁₂N₂O₂S; MS: m/z 308 (M⁺); Elemental analysis (CHN) Theoretical calc: C, 66.22; H, 3.92; N, 9.08 Found: C, 66.25; H, 3.90; N, 9.09

5-((E)-4-((E)-hydrazonomethyl)benzylidene)thiazolidine-2,4-dione: m.p. °C: 220–222; Rf value: 0.74^c; % yield: 60; IR (KBr pellets) cm⁻¹: 1740.11 (C=O str., thiazolidin-2,4-dione ring), 1682.74 (C=N str., imine group), 1412.68 (C=C str., aromatic ring), 1615.22 (C=C str., methylene group), 3197.24 (C–H str., aromatic ring), 2922.17 (C–H str., aliphatic), 1224.86 (C–N str., thiazolidine ring), 618.11 (C–S bend., thiazolidine ring); ¹H-NMR (δ, DMSO): 6.58–7.79 (m, 4H, Ar–H), 7.81 (s, 1H, –CH=), 8.68(s, 1H, CH=N), 1.92 (s, 2H, NH₂), 12.49 (s, 1H, NH); M. Formula: C₁₁H₉N₃O₂S; Elemental analysis (CHN) Theoretical calc: C, 53.43; H, 3.67; N, 16.99 Found: C, 53.45; H, 3.68; N, 16.95

5-((E)-4-((E)-(2-phenylhydrazono)methyl)benzylidene)thiazolidine-2,4-dione: m.p. °C: 308–310; Rf value: 0.8^d; % yield: 78; IR (KBr pellets) cm⁻¹: 3441.91 (N–H str., phenyl hydrazine group), 3286.35 (N–H str., thiazolidine ring), 1726.16 (C=O str., thiazolidin-2,4-dione ring), 1677.76 (C=N str., imine group), 1413.66 (C=C str., aromatic ring), 1584.3 (C=C str., methylene group), 3043.30 (C–H str., aromatic ring), 1328.68 (C–N str., thiazolidine ring), 613.72 (C–S bend., thiazolidine ring); ¹H-NMR (δ, DMSO): 6.77–7.79 (m, 4H, Ar–H), 7.80 (s, 1H, –CH=), 7.88(s, 1H, CH=N), 10.61 (s, 1H, NH adjacent to phenyl ring), 12.49 (s, 1H, NH of thiazolidine ring); M. Formula: C₁₇H₁₃N₃O₂S; MS: m/z 323.9 (M⁺ + 1), 321.9 (M⁺ − 1); Elemental analysis (CHN) Theoretical calc: C, 63.14; H, 4.05; N, 12.99 Found: C, 63.16; H, 4.05; N, 12.98

5-((E)-4-((E)-((2-chlorophenyl)imino)methyl)benzylidene)thiazolidine -2,4-dione: m.p. °C: 292–294; Rf value: 0.71^d; % yield: 70; IR (KBr pellets) cm⁻¹: 3381.37 (N–H str., thiazolidine ring), 1741.97 (C=O str., thiazolidin-2,4-dione ring), 1694.84 (C=N str., imine group), 1505.9 (C=C str., aromatic ring), 1606.57 (C=C str., methylene group), 3044.79 (C–H str., aromatic ring), 2978.2 (C–H str., aliphatic), 1305.25 (C–N str., thiazolidine ring), 606.87 (C–S bend., thiazolidine ring), 750.70 (C–Cl bend., o-substitution on phenyl ring); ¹H NMR (δ, DMSO): 6.77–7.79 (m, 4H, Ar–H), 7.80 (s, 1H, –CH=), 7.88(s, 1H, CH=N), 10.61 (s, 1H, NH adjacent to phenyl ring), 12.49 (s, 1H, NH of thiazolidine ring); M. Formula: C₁₇H₁₁ClN₂O₂S; Elemental analysis (CHN) Theoretical calc: C, 59.56; H, 3.23; N, 8.17 Found: C, 59.60; H, 3.25; N, 8.12

5-((E)-4-((E)-((3-chlorophenyl)imino)methyl)benzylidene) thiazolidine-2,4-dione: m.p. °C: 280–282; Rf value: 0.73^d; % yield: 75; IR (KBr pellets) cm⁻¹: 3381.59 (N–H str., thiazolidine ring), 1741.81 (C=O str., thiazolidin-2,4-dione ring), 1695.1 (C=N str., imine group), 1479.44 (C=C str., aromatic ring), 1596.41 (C=C str., methylene group), 3050.78 (C–H str., aromatic ring), 2978.82 (C–H str., aliphatic), 1308.79 (C–N str., thiazolidine ring), 594.24 (C–S bend., thiazolidine ring), 777.34 (C–Cl bend., m-substitution on phenyl ring); ¹H NMR (δ, DMSO): 7.23–8.07 (m, 8H, Ar–H), 7.81 (s, 1H, –CH=), 8.68 (s, 1H, CH=N), 12.58 (s, 1H, NH); M. Formula: C₁₇H₁₁ClN₂O₂S; MS: m/z 341.43 (M⁺ − 1); Elemental analysis (CHN) Theoretical calc: C, 59.56; H, 3.23; N, 8.17 Found: C, 59.62; H, 3.23; N, 8.18

5-((E)-4-((E)-((furan-2-ylmethyl)imino)methyl)benzylidene) thiazolidine-2,4-dione: m.p. °C: 92–94; Rf value: 0.71^a; % yield: 70; IR IR (KBr pellets) cm⁻¹: 3328.11 (N–H str., thiazolidine ring), 1694.77 (C=O str., thiazolidin-2,4-dione ring), 1610.48 (C=N str., imine group), 1423.16 (C=C str., aromatic ring), 1548.31 (C=C str., methylene group), 3045.54 (C–H str., aromatic ring), 2975.08 (C–H str., aliphatic), 1306.66 (C–N str., thiazolidine ring), 603.55 (C–S bend., thiazolidine ring), 1159.90 (C–C str.), 1012.66 (C–O–C str., furan ring); ¹H NMR (δ, DMSO): 7.18–7.88 (m, 4H, Ar–H), 7.78 (s, 1H, –CH=), 8.76 (s, 1H, CH=N), 12.48 (s, 1H, NH), 4.77 (d, 2H, –CH₂ adjacent to furan ring), 6.30 (d, 1H, CH of furan ring at 3^rd position), 6.42 (t, 1H, CH of furan ring at 4th position), 7.47 (d, 1H, CH of furan ring adjacent to O); M. Formula: C₁₆H₁₂N₂O₃S; MS: m/z 313.16 (M⁺ + 1); Elemental analysis (CHN) Theoretical calc: C, 61.53; H, 3.87; N, 8.97 Found: C, 61.55; H, 3.90; N, 8.95

5-((E)-4-((E)-(m-tolylimino)methyl)benzylidene)thiazolidine-2,4-dione: m.p. °C: 90–92; Rf value: 0.81^a; % yield: 65; IR (KBr pellets) cm⁻¹: 3378.54 (N–H str., thiazolidine ring), 1743.48 (C=O str., thiazolidin-2,4-dione ring), 1691.85 (C=N str., imine group), 1487.15 (C=C str., aromatic ring), 1602.26 (C=C str., methylene group), 3036.12 (C–H str., aromatic ring), 2967.46 (C–H str., aliphatic), 1321.95 (C–N str., thiazolidine ring), 597.53 (C–S bend., thiazolidine ring), 1154.43 (C–C str.); ¹H NMR (δ, DMSO): 7.08–8.06 (m, 8H, Ar–H), 7.62 (s, 1H, –CH=), 8.43 (s, 1H, CH=N), 12.34 (s, 1H, NH), 2.14(s, 3H, CH₃); M. Formula: C₁₈H₁₄N₂O₂S; MS: m/z 320.96 (M⁺ − 1); Elemental analysis (CHN) Theoretical calc: C, 67.06; H, 4.38; N, 8.69 Found: C, 67.09; H, 4.39; N, 8.71

5-((E)-4-((E)-(p-tolylimino)methyl)benzylidene)thiazolidine-2,4-dione: m.p. °C: 160–162; Rf value: 0.84^a; % yield: 75; IR (KBr pellets) cm⁻¹: 3375.37 (N–H str., thiazolidine ring), 1744.26 (C=O str., thiazolidin-2,4-dione ring), 1695.41 (C=N str., imine group), 1507.28 (C=C str., aromatic ring), 1604.31 (C=C str., methylene group), 3162.34 (C–H str., aromatic ring), 3048.39 (C–H str., aliphatic), 1330.13 (C–N str., thiazolidine ring), 607.48 (C–S bend., thiazolidine ring), 1155.49 (C–C str.); ¹H NMR (δ, DMSO): 6.80–8.06 (m, 8H, Ar–H), 7.72 (s, 1H, –CH=), 8.71 (s, 1H, CH=N), 12.32 (s, 1H, NH), 2.33(s, 3H, CH₃); M. Formula: C₁₈H₁₄N₂O₂S; MS: m/z 322.01 (M⁺); Elemental analysis (CHN) Theoretical calc: C, 67.06; H, 4.38; N, 8.69 Found: C, 67.11; H, 4.39; N, 8.65

5-((E)-4-((E)-((2,4-dimethylphenyl)imino)methyl)benzylidene) thiazolidine-2,4-dione: m.p. °C: 134–136; Rf value: 0.81^a; % yield: 65; IR (KBr cm⁻¹): 3398.47 (N–H str., thiazolidine ring), 1744.74 (C=O str., thiazolidin-2,4-dione ring), 1699.13 (C=N str., imine group), 1498.40 (C=C str., aromatic ring), 1601.47 (C=C str., methylene group), 3012.68 (C–H str., aromatic ring), 2973.04 (C–H str., aliphatic), 1291.9 (C–N str., thiazolidine ring), 605.41 (C–S bend., thiazolidine ring), 1152.01 (C–C str.); ¹H NMR (δ, DMSO): 7.02–8.06 (m, 7H, Ar–H), 7.82 (s, 1H, –CH=), 8.58 (s, 1H, CH=N), 12.12 (s, 1H, NH), 2.28(s, 3H, CH₃ o-position), 2.29(s, 3H, CH₃ p-position); M. Formula: C₁₉H₁₆N₂O₂S; MS: m/z 334.99 (M⁺ − 1); Elemental analysis (CHN) Theoretical calc: C, 67.84; H, 4.79; N, 8.33 Found: C, 67.87; H, 4.79; N, 8.36

5-((E)-4-((E)-((2,6-dimethylphenyl)imino)methyl)benzylidene) thiazolidine-2,4-dione: m.p. °C: 100–102; Rf value: 0.73^a; % yield: 60; IR (KBr cm⁻¹): 3394.22 (N–H str., thiazolidine ring), 1744.97 (C=O str., thiazolidin-2,4-dione ring), 1702.53 (C=N str., imine group), 1470.88 (C=C str., aromatic ring), 1602.92 (C=C str., methylene group), 3032.72 (C–H str., aromatic ring), 2971.09 (C–H str., aliphatic), 1294.35 (C–N str., thiazolidine ring), 606.56 (C–S bend., thiazolidine ring), 1159.9 (C–C str.); ¹H NMR (δ, DMSO): 6.77–8.10 (m, 7H, Ar–H), 7.84 (s, 1H, –CH=), 8.42 (s, 1H, CH=N), 12.32 (s, 1H, NH), 2.08(s, 6H, CH_{3 o}-position); M. Formula: C₁₉H₁₆N₂O₂S; MS: m/z 334.98 (M⁺ − 1), 337 (M⁺ + 1); Elemental analysis (CHN) Theoretical calc: C, 67.84; H, 4.79; N, 8.33 Found: C, 67.85; H, 4.79; N, 8.36

5-((E)-4-((E)-((2-fluorophenyl)imino)methyl)benzylidene) thiazolidine-2,4-dione: m.p. °C: 108–110; Rf value: 0.69^a; % yield: 75; IR (KBr cm⁻¹): 3429.95 (N–H str., thiazolidine ring), 1745.15 (C=O str., thiazolidin-2,4-dione ring), 1695.31 (C=N str., imine group), 1492.16 (C=C str., aromatic ring), 1604.74 (C=C str., methylene group), 3051.62 (C–H str., aromatic ring), 2979.31 (C–H str., aliphatic), 1323.63 (C–N str., thiazolidine ring), 606.47 (C–S bend., thiazolidine ring), 1158.78 (C–C str.), 1009.17 (C-F bend., o-substitution on phenyl ring); ¹H NMR (δ, DMSO): 7.26–7.76 (m, 8H, Ar–H), 7.83 (s, 1H, –CH=), 8.68 (s, 1H, CH=N), 12.51 (s, 1H, NH); M. Formula: C₁₇H₁₁N₂O₂SF; MS: m/z 327.05 (M⁺ + 1); Elemental analysis (CHN) Theoretical calc: C, 62.57; H, 3.40; N, 8.58 Found: C, 62.60; H, 3.41; N, 8.60

5-((E)-4-((E)-((3-bromophenyl)imino)methyl)benzylidene) thiazolidine-2,4-dione: m.p. °C: 98–100; Rf value: 0.82^a; % yield: 80; IR (KBr cm⁻¹): 3437.95 (N–H str., thiazolidine ring), 1744.75 (C=O str., thiazolidin-2,4-dione ring), 1698.27 (C=N str., imine group), 1484.71 (C=C str., aromatic ring), 1606.87 (C=C str., methylene group), 3052.46 (C–H str., aromatic ring), 2976.98 (C–H str., aliphatic), 1328.18 (C–N str., thiazolidine ring), 606.38 (C–S bend., thiazolidine ring), 1161.85 (C–C str.), 637.54 (C–Br bend., p-substitution on phenyl ring); ¹H NMR (δ, DMSO): 7.03–8.12 (m, 8H, Ar–H), 7.78 (s, 1H, –CH=), 8.72 (s, 1H, CH=N), 12.64 (s, 1H, NH); M. Formula: C₁₇H₁₁N₂O₂SBr; Elemental analysis (CHN) Theoretical calc: C, 52.73; H, 2.86; N, 7.23 Found: C, 52.75; H, 2.87; N, 7.23

5-((E)-4-((E)-((3-nitrophenyl)imino)methyl)benzylidene)thiazolidine-2,4-dione: m.p. °C: 128–130; Rf value: 0.79^a; % yield: 80; IR (KBr cm⁻¹): 3379.48 (N–H str., thiazolidine ring), 1747.82 (C=O str., thiazolidin-2,4-dione ring), 1700.55 (C=N str., imine group), 1522.68 (C=C str., aromatic ring), 1600.01 (C=C str., methylene group), 3034.11 (C–H str., aromatic ring), 2928.16 (C–H str., aliphatic), 1347.29 (C–N str., thiazolidine ring), 606.91 (C–S bend., thiazolidine ring), 1153.91 (C–C str.), 1208.69 (N–O str., m-substitution on phenyl ring), 1413.00 (N=O str., m-substitution on phenyl ring); ¹H NMR (δ, DMSO): 7.23–8.09 (m, 8H, Ar–H), 7.77 (s, 1H, –CH=), 8.80 (s, 1H, CH=N), 12.67 (s, 1H, NH); M. Formula: C₁₇H₁₁N₃O₄S; MS: m/z 352.04 (M⁺ − 1); Elemental analysis (CHN) Theoretical calc: C, 57.79; H, 3.14; N, 11.89 Found: C, 57.82; H, 3.15; N, 11.91

5-((E)-4-((E)-((4-chloro-2-nitrophenyl)imino)methyl)benzylidene) thiazolidine-2,4-dione: m.p. °C: 92–94; Rf value: 0.81^a; % yield: 75; IR (KBr cm⁻¹): 3356. 19 (N–H str., thiazolidine ring), 1747.59 (C=O str., thiazolidin-2,4-dione ring), 1700.69 (C=N str., imine group), 1502.15 (C=C str., aromatic ring), 1602.45 (C=C str., methylene group), 3030.51 (C–H str., aromatic ring), 2926.60 (C–H str., aliphatic), 1338.08 (C–N str., thiazolidine ring), 607.48 (C–S bend., thiazolidine ring), 1160.38 (C–C str.), 1249.21 (N–O str., o-substitution on phenyl ring), 1456.19 (N=O str., o-substitution on phenyl ring), 764.11 (C–Cl bend., p-substitution on phenyl ring); ¹H NMR (δ, DMSO): 7.03–8.01 (m, 7H, Ar–H), 7.73 (s, 1H, –CH=), 8.03 (s, 1H, CH=N), 12.70 (s, 1H, NH); M. Formula: C₁₇H₁₀N₃O₄SCl; Elemental analysis (CHN) Theoretical calc: C, 52.65; H, 2.60; N, 10.84 Found: C, 52.67; H, 2.60; N, 10.87

5-((E)-4-((E)-((2-methoxyphenyl)imino)methyl)benzylidene) thiazolidine-2,4-dione: m.p. °C: 104–106; Rf value: 0.81^a; % yield: 70; IR (KBr cm⁻¹): 3396.28 (N–H str., thiazolidine ring), 1744.31 (C=O str., thiazolidin-2,4-dione ring), 1702.51 (C=N str., imine group), 1504.09 (C=C str., aromatic ring), 1602.96 (C=C str., methylene group), 3050.93 (C–H str., aromatic ring), 2930.71 (C–H str., aliphatic), 1293.57 (C–N str., thiazolidine ring), 606.45 (C–S bend., thiazolidine ring), 1161.16 (C–C str.), 1018.82 (O–CH₃ str., o-substitution on phenyl ring); ¹H NMR (δ, DMSO): 6.75–7.72 (m, 8H, Ar–H), 7.78 (s, 1H, –CH=), 8.58 (s, 1H, CH=N), 12.61 (s, 1H, NH), 3.77 (s, 3H, OCH₃); M. Formula: C₁₈H₁₄N₂O₃S; MS: m/z 339.12 (M⁺ + 1); Elemental analysis (CHN) Theoretical calc: C, 63.89; H, 4.17; N, 8.28 Found: C, 63.91; H, 4.17; N, 8.33

5-((E)-4-((E)-((3-methoxyphenyl)imino)methyl)benzylidene) thiazolidine-2,4-dione: m.p. °C: 176–178; Rf value: 0.82^a; % yield: 65; IR (KBr cm⁻¹): 3380.83 (N–H str., thiazolidine ring), 1742.00 (C=O str., thiazolidin-2,4-dione ring), 1696.51 (C=N str., imine group), 1498.71 (C=C str., aromatic ring), 1601.06 (C=C str., methylene group), 2926.44 (C–H str., aliphatic), 1321.31 (C–N str., thiazolidine ring), 605.30 (C–S bend., thiazolidine ring), 1155.65 (C–C str.), 1029.32 (O–CH₃ str., m-substitution on phenyl ring); ¹H NMR (δ, DMSO): 6.58–8.05 (m, 8H, Ar–H), 7.73 (s, 1H, –CH=), 8.68 (s, 1H, CH=N), 12.32 (s, 1H, NH), 3.85(s, 3H, OCH₃); M. Formula: C₁₈H₁₄N₂O₃S; MS: m/z 338.8 (M⁺ + 1); Elemental analysis (CHN) Theoretical calc: C, 63.89; H, 4.17; N, 8.28 Found: C, 63.92; H, 4.17; N, 8.31

5-((E)-4-((E)-((4-methoxyphenyl)imino)methyl)benzylidene) thiazolidine-2,4-dione: m.p. °C: 130–132; Rf value: 0.77^a; % yield: 75; IR (KBr cm⁻¹): 3444.26 (N–H str., thiazolidine ring), 1743.88 (C=O str., thiazolidin-2,4-dione ring), 1702.79 (C=N str., imine group), 1505.14 (C=C str., aromatic ring), 1614.33 (C=C str., methylene group), 3065.92 (C–H str., aromatic ring), 2926.15 (C–H str., aliphatic), 1291.79 (C–N str., thiazolidine ring), 606.22 (C–S bend., thiazolidine ring), 1155.22 (C–C str.), 1024.26 (O–CH₃ str., o-substitution on phenyl ring); ¹H NMR (δ, DMSO): 6.98–8.04 (m, 8H, Ar–H), 7.78 (s, 1H, –CH=), 8.71 (s, 1H, CH=N), 12.42 (s, 1H, NH), 3.78(s, 3H, OCH₃); M. Formula: C₁₈H₁₄N₂O₃S; MS: m/z 338.98 (M⁺ + 1); Elemental analysis (CHN) Theoretical calc: C, 63.89; H, 4.17; N, 8.28 Found: C, 63.93; H, 4.17; N, 8.30

5-((E)-4-((E)-((4-fluorophenyl)imino)methyl)benzylidene) thiazolidine-2,4-dione: m.p. °C: 104–106; Rf value: 0.83^a; % yield: 70; IR (KBr cm⁻¹): 3431.86 (N–H str., thiazolidine ring), 1743.59 (C=O str., thiazolidin-2,4-dione ring), 1697.01 (C=N str., imine group), 1501.17 (C=C str., aromatic ring), 1612.03 (C=C str., methylene group), 3039.20 (C–H str., aromatic ring), 2925.63 (C–H str., aliphatic), 1292.50 (C–N str., thiazolidine ring), 604.82 (C–S bend., thiazolidine ring), 1152.02 (C–C str.), 1012.73 (C-F str., p-substitution on phenyl ring); ¹H NMR (δ, DMSO): 6.77–7.78 (m, 8H, Ar–H), 7.77 (s, 1H, –CH=), 7.87 (s, 1H, CH=N), 12.60 (s, 1H, NH); M. Formula: C₁₇H₁₁N₂O₂SF; MS: m/z 324.85 (M⁺ − 1); Elemental analysis (CHN) Theoretical calc: C, 62.57; H, 3.40; N, 8.58 Found: C, 62.58; H, 3.40; N, 8.59

5-((E)-4-((E)-((4-nitrophenyl)imino)methyl)benzylidene)thiazolidine-2,4-dione: m.p. °C: 118–120; Rf value: 0.83^a; % yield: 75; IR (KBr cm⁻¹): 3369.56 (N–H str., thiazolidine ring), 1743.23 (C=O str., thiazolidin-2,4-dione ring), 1698.03 (C=N str., imine group), 1503.33 (C=C str., aromatic ring), 1601.16 (C=C str., methylene group), 3052.03 (C–H str., aromatic ring), 2925.51 (C–H str., aliphatic), 1310.97 (C–N str., thiazolidine ring), 608.61 (C–S bend., thiazolidine ring), 1163.00 (C–C str.), 1212.91 (N–O str., p-substitution on phenyl ring), 1412.67 (N=O str., p-substitution on phenyl ring); ¹H NMR (δ, DMSO): 6.60–8.28 (m, 8H, Ar–H), 7.78 (s, 1H, –CH=), 8.72 (s, 1H, CH=N), 12.62 (s, 1H, NH); M. Formula: C₁₇H₁₁N₃O₄S; Elemental analysis (CHN) Theoretical calc: C, 57.79; H, 3.14; N, 11.89 Found: C, 57.80; H, 3.14; N, 11.88

5-((E)-4-((E)-(dodecylimino)methyl)benzylidene)thiazolidine-2,4-dione: m.p. °C: 106–108; Rf value: 0.43^a; % yield: 60; IR (KBr cm⁻¹): 3339.52 (N–H str., thiazolidine ring), 1699.02 (C=O str., thiazolidin-2,4-dione ring), 1608.43 (C=N str., imine group), 1461.90 (C=C str., aromatic ring), 1562.34 (C=C str., methylene group), 3047.23 (C–H str., aromatic ring), 2923.03 (C–H str., aliphatic), 1296.98 (C–N str., thiazolidine ring), 608.00 (C–S bend., thiazolidine ring), 1165.06 (C–C str.); ¹H NMR (δ, DMSO): 7.28–7.98 (m, 4H, Ar–H), 7.78 (s, 1H, –CH=), 8.35 (s, 1H, CH=N), 12.62 (s, 1H, NH), 1.23–1.69 (m, 20H, CH₂), 0.84 (t, J = 9.00 Hz, 3H, CH₃), 3.66 (m, 2H, CH₂ adjacent to CH=N); M. Formula: C₂₃H₃₂N₂O₂S; MS: m/z 401.12 (M⁺ + 1), 399.09 (M⁺ − 1); Elemental analysis (CHN) Theoretical calc: C, 68.96; H, 8.05; N, 6.99 Found: C, 68.97; H, 8.05; N, 6.98