Mass spectra of cyclopenin and viridicatin

Mass spectra of cyclopenin (I), viridicatin (III), 3-benzylidene-3,4-dihydro-4-methyl-1H-1,4-benzodiazepin-2,5-dione (VI) and derivatives of these systems were measured. Fragmentation schemes are proposed based on high resolution data, metastable peaks and, where appropriate, on deuterium labeling. The decomposition of I is found to follow pathways different in several respects from those proposed by Luckner et al. on the basis of low resolution spectra.

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