Table 1.
Elemental compositions of pneumocysterol and euphorbol major ions obtained by high-resolution GLC–MS analyses
| Molecular ion (M+⋅) and characteristic ion fragments (m/z) | Elemental composition | Calculated exact mass | Experimental exact mass | Deviation, molecular mass units |
|---|---|---|---|---|
| Pneumocysterol | ||||
| 454 (M+⋅) | C32H54O | 454.4174 | 454.4199 | 2.5 |
| 439 (M+⋅–CH3) | C31H51O | 439.3940 | 439.3921 | −1.9 |
| 436 (M+⋅–H2O) | C32H52 | 436.4069 | 436.4046 | −2.3 |
| 421 (M+⋅–CH3, –H2O) | C31H49 | 421.3834 | 421.3824 | −1.0 |
| Euphorbol | ||||
| 440 (M+⋅) | C31H52O | 440.4018 | 440.4055 | 3.7 |
| 425 (M+⋅–CH3) | C30H49O | 425.3783 | 425.3774 | −0.9 |
| 422 (–H2O) | C31H50 | 422.3912 | 422.3878 | −3.4 |
| 407 (M+⋅–CH3, –H2O) | C30H47 | 407.3677 | 407.3617 | −6.0 |