InChI=1S/C23H34O4/c1-6-7-8-12-18-15-20(27-5)19(22(24)21(18)23(25)26)14-13-17(4)11-9-10-16(2)3/h10,13,15,24H,6-9,11-12,14H2,1-5H3,(H,25,26)/b17-13+