InChI=1S/C28H31NO4/c1-19-25-18-23(31)10-13-26(25)33-28(27(19)20-4-8-22(30)9-5-20)21-6-11-24(12-7-21)32-17-16-29-14-2-3-15-29/h4-13,18-19,27-28,30-31H,2-3,14-17H2,1H3/t19-,27-,28+/m1/s1