ARGOPHYLLINB

(Z)-2-Methyl-2-butenoic acid (1aR,3S,4S,5aR,8aS,9R,10aR)-dodecahydro-3-hydroxy-4-(hydroxymethyl)-10a-methyl-8-methylene-7-oxooxireno[5,6]cyclodeca[1,2-b]furan-9-yl ester