Synonyms: 2-Cyclopenten-1-one,3,4-dihydroxy-2-isovaleryl-5-(3-methyl-2-butenyl)-, (4S)- (8CI);2-Cyclopenten-1-one,3,4-dihydroxy-5-(3-methyl-2-butenyl)-2-(3-methyl-1-oxobutyl)-, (4S,5R)- (9CI);2-Cyclopenten-1-one,3,4-dihydroxy-5-(3-methyl-2-butenyl)-2-(3-methyl-1-oxobutyl)-, (4S-cis)-;Humulinic acid B (7CI)