Abstract
Microbial transformation of the germacranolide parthenolide using
Rhizopus nigricans,
Streptomyces fulvissimus and
Rhodotorula rubra yielded three new compounds: 11αH-dihydroparthenolide, 9β-hydroxy-11βH-dihydroparthenolide and 14-hydroxy-11βH-dihydroparthenolide. 11βH-dihydroparthenolide was the only common metabolite produced by all microorganisms.