(-)-Parthenolide 119325-19-8 120852-67-7 20554-84-1 344906-67-8 4,5-alpha-Epoxy-6-beta-hydroxygermacra-1(10),11(13)-dien-12-oic acid gamma-lactone Germacra-1(10),11(13)-dien-12-oic acid, 4,5-alpha-epoxy-6-beta-hydroxy-, gamma-lactone NSC 157035 Oxireno(9,10)cyclodeca(1,2-b)furan-9(1aH)-one, 2,3,6,7,7a,8,10a,10b-octahydro-1a,5-dimethyl-8-methylene-, (1aR,4E,7aS,10aS,10bS)- Parthenolide