InChI=1S/C23H24O4/c1-14(2)4-7-17-8-9-18(13-20(17)25)22-15(3)21(27-23(22)26)12-16-5-10-19(24)11-6-16/h4-6,8-13,15,22,24-25H,7H2,1-3H3/b21-12-