2H,4aH-1,4,5-Trioxadicyclopent(a,hi)indene-7-carboxylic acid, 3-ethylidene-3,3a,7a,9b-tetrahydro-2-oxo-, methyl ester, (3aS-(3E,3aalpha,4abeta,7abeta,9aR*,9bbeta))- 77-16-7 NSC 112152 Plumericin