InChI=1S/C25H28O4/c1-16-8-6-5-7-9-19-10-11-20(28-15-19)21-22(26)25(29-23(21)27)14-18(3)17(2)13-24(25,4)12-16/h6,8-13,18H,5,7,14-15H2,1-4H3/b8-6-,16-12-,19-9-,21-20+/t18-,24-,25+/m0/s1