The crystal structure of (6aR,6bS,8aS,8bR,9S,11aS,12aS,12bS)-10-(4-acetoxy-3-methylbutyl)-6a,8a,9-trimethyl-3,4,5,6,6a,6b,7,8,8a,8b,9,10,11a,12,12a,12b-hexadecahydro-1H-naphtho[2′,1′:4,5]indeno[2,1-b]furan-4-yl acetate, C31H48O5