Synonyms: 1H-Cyclopenta[a]pentalene-2-carboxylicacid, 6b,6ab-epoxy-2,3,3aa,3b,4,5,6,6a,7,7aa-decahydro-5b-hydroxy-2b,3bb-dimethyl-4-methylene- (7CI,8CI);Cyclopenta[4,5]pentaleno[1,6a-b]oxirene-5-carboxylic acid,decahydro-2-hydroxy-3a,5-dimethyl-3-methylene-, [1aR-(1aa,2b,3ab,3ba,5a,6aa,7aS*)]-; (+)-Hirsutic acid; (+)-Hirsutic acid C; Hirsutic acid; Hirsuticacid C