plumericin

(3aS,3E,4aα,7aα,9aS,9bα)-3-Ethylidene-3,3a,7a,9b-tetrahydro-2-oxo-2H,4aH-1,4,5-trioxa-1H-dicyclopent[a,hi]indene-7-carboxylic acid methyl ester