Electrospray tandem mass spectrometric analysis of a dimeric conjugate, salvialeriafone and related compounds

BMC Chemistry

Table 1 Positive ionization HR-ESI-MS data and common neutral losses of diterpenoids 1–6

S.No.	[M+H]⁺	Exact Mass	Observed mass	Error (ppm)	[M+H-H₂O]⁺	[M+H-CO]⁺	[M+H-C₃H₆]⁺	[M+H-2H₂O]⁺	[M+H- C₃H₇]^+.	[M+H-C₃H₆- H₂O]⁺	[M+H- H₂O-CO]⁺	[M+H-C₃H₆- H₂O-CO]⁺	Base Peak
1	C₃₉H₄₉O₇⁺	629.3472	629.3444	−4.58	611	-	569	-	568 [M+H- H₂O-C₃H₇]^+.	569	-	-	569 [M+H-C₃H₆- H₂O]⁺
2	C₂₀H₂₇O₃⁺	315.1965	315.1983	5.49	297	-	273	-	272	255	269	227	245 [M+H-C₃H₆-C₂H₄]⁺
3	C₂₀H₂₇O₅⁺	347.1863	347.1871	2.02	329	319	-	311	-	-	301	255	283 [M+H-2H₂O-CO]⁺
4	C₂₁H₃₁O₄⁺	347.2227	347.2226	−0.53	315 [M+H- CH₃OH]⁺	-	-	-	-	297 [M+H- CH₃OH-H₂O]⁺	255 [M+H- CH₃OH-H₂O-C₃H₆]⁺	269 [M+H- CH₃OH-H₂O-CO]⁺	269 [M+H- CH₃OH-H₂O-CO]⁺
5	C₂₀H₂₇O₅⁺	347.1863	347.1862	−0.57	329	-		311	-	-	301	259	281 [M+H-2H₂O-CH₂O]⁺
6	C₁₉H₂₃O₃⁺	299.1641	299.1674	10.79	281	-	-	-	256	239	253	211	256 [M+H- C₃H₇]^+.

ISSN: 2661-801X