Synonyms: 7bH-Germacran-12-oic acid, 1a,4-epoxy-3,6b,8b-trihydroxy-, 12,8-lactone, 6-isobutyrate, (11R)-(8CI); Isobutyric acid, 6-ester with 1a,4-epoxy-3,6b,8b-trihydroxy-7bH-germacran-12-oic acid 12,8-lactone, (11R)- (8CI); Octahydrozexbrevin;Zexbrevin, octahydro-