2513-77-1 29552-41-8 4xi-Germacra-1(10),11(13)-dien-12-oic acid, 4,5-epoxy-6.alpha.-hydroxy-, gamma-lactone 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-