2-Butenoic acid, 2-methyl-, 8,9-dihydro-8-(1-methyl-1-((2-methyl-1-oxo-2-butenyl)oxy)ethyl)-2-oxo-2H-furo(2,3-h)-1-benzopyran-9-yl ester, (8S-(8alpha(Z),9alpha(Z)))- 2607-56-9 Archanagelicine Archangelicin