Abstract:
4alpha, 5alpha-Dihydroxysantonin (4) and ethyl 3-oxoeudesma-4, 6- diene-12-oate (2, 4-DNP derivative 3) have been characterised as microbial transformation products of alpha-santonin (1) by Pseudomonas cichorii S. The assigned structures have been confirmed by their partial chemical synthesis from alpha-santonin.