InChI=1S/C27H31NO4/c1-18(2)14-22(29)15-19(3)10-11-23-24(32-4)16-21-17-28(27(31)25(21)26(23)30)13-12-20-8-6-5-7-9-20/h5-10,14,16,30H,11-13,15,17H2,1-4H3/b19-10+