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

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

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]+.