InChI=1S/C20H23NO6/c1-11(22)27-17-9-21-8-13-14(7-15-19(18(13)24-3)26-10-25-15)20(17)5-4-12(23-2)6-16(20)21/h4-5,7,12,16-17H,6,8-10H2,1-3H3