6-cyano-8-(2-methyl-1,3-dioxolan-2-yl)-1,5,12-trimethoxy-11-oxo-6,6a,7,8,9,10,10a,11-octahydronaphthacene

2--4-(2-methyl-1,3-dioxolan-2-yl)cyclohexane-1-carboxylic acid