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Table 2 Negative 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-CH4]- [M+H-CH3]- [M+H- C3H7]-. [M+H-C3H7- CO]-. [M+H- H2O-CO]- [M+H-CH4-CO]- Base Peak
1 C39H49O7+ 627.3327 627.3372 7.1286 - - - - 584 556 538 [M+H-C3H7- CO-H2O]-. - 584 [M+H-C3H7]-.
2 C20H27O3+ 313.1809 313.1789 −6.4452 - 285 297 298 - - - 269 285 [M+H-CO]-
3 C20H27O5+ 345.1707 345.1694 −3.9046 327 317 - - - - 299 - 317 [M+H-CO]-
4 C21H31O4+ 345.2071 345.2075 1.0622 315 [M+H-CH2O]- - - 330 - - 287 [M+H-CH2O-CO]- -  
5 C20H27O5+ 345.1707 345.1698 −2.7458 327 317 - - - - - - 179
6 C19H23O3+ 297.1496 297.1512 5.3227 - 269 281 282 - - - 253 269 [M+H-CO]-