1H-4,9a-Ethanocyclohepta(c)pyran-7-carboxylic acid, 4a-(acetyloxy)-3-(4-carboxy-1,3-pentadienyl)3,4,4a,5,6,9-hexahydro-3-methyl-1-oxo-, 7-methyl ester, (3-alpha(1E,3E),4-alpha,4a-alpha,9a-alpha)-(-)- (9CI) 82508-31-4 Pseudolaric acid B