InChI=1S/C23H28O6/c1-5-28-23(3,4)20(24)8-6-15(2)10-12-27-22-16-7-9-21(25)29-19(16)14-18-17(22)11-13-26-18/h7,9-11,13-14,20,24H,5-6,8,12H2,1-4H3/b15-10+/t20-/m1/s1