Showing structure for (1ar,3r,3ar,4r,5r,6r,7as)-4,5-bis(acetyloxy)-6-[(3r,4r)-3-(2-methoxy-2-oxoethyl)-2,2,4-trimethyl-7-oxo-3h-oxepin-4-yl]-3a-methyl-7-methylidene-hexahydroindeno[1,7a-b]oxirene-3-carboxylic acid