The mass fragmentation pattern of the antitumor antibiotic staurospori
ne (1), a potent PKC inhibitor, has been studied by HREIMS and by usin
g deuterium-labeled samples of 1, derived from incorporation experimen
ts with [6-H-2(2)]-D-glucose, [2-H-2]-D-glucose, [U-H-2(2)]-D-glucose,
and deuterium oxide.