Studies on morphine alkaloids—IX. The mass spectra of indolinocodeine and its derivatives

The mass spectra of indolinocodeine and its derivatives have been determined. Some of the fragmentation pathways are discussed on the basis of high-resolution mass spectrometry and deuterium labelling. Although basic fragmentation patterns for this series of compounds are similar to each other, the substituents in B- and/or C-ring were found to determine the course of the fragmentation.