Synonyms: Germacra-3,9-diene-12,15-dioicacid, 5,6,8-trihydroxy-, 12,8-lactone, methyl ester, 5-acetate2,3-dihydroxy-2-methylbutyrate (8CI); Butyric acid, 2,3-dihydroxy-2-methyl-,6-ester with 5,6,8-trihydroxygermacra-3,9-diene-12,15-dioic acid 12,8-lactonemethyl ester acetate (8CI); Polydalin, tetrahydro-; Tetrahydropolydalin