(6aS,7R,13S,14S,16R)-Allyl 5-(allyloxy)-14-cyano-8,10-dihydroxy-16-(hydroxymethyl)-9-methoxy-4-methyl-6a,7,12,13,14,16-hexahydro-6H-7,13-epiminobenzo[4,5]azocino[1,2-b][1,3]dioxolo[4,5-h]isoquinoline-