6468-80-0

(Z)-2-Methyl-2-butenoic acid (9S)-9,10-dihydro-8,8-dimethyl-10β-[(3-methyl-1-oxo-2-butenyl)oxy]-2-oxo-2H,8H-benzo[1,2-b:3,4-b]dipyran-9-yl ester