Synonyms: 2-Pentenedioicacid, 3-methyl-,1-[(7S)-5-chloro-3-[(1E,3E,5S)-3,5-dimethyl-1,3-heptadienyl]-7,8-dihydro-7-methyl-6,8-dioxo-6H-2-benzopyran-7-yl]ester, (2E)- (9CI); 2-Pentenedioic acid, 3-methyl-,1-[5-chloro-3-(3,5-dimethyl-1,3-heptadienyl)-7,8-dihydro-7-methyl-6,8-dioxo-6H-2-benzopyran-7-yl]ester, [S-[R*,R*-(E,E,E)]]-; Helicusin A