InChI=1S/C23H28O5/c1-15(7-9-20(24)23(2,3)4)11-13-27-22-16-6-5-12-26-18(16)14-19-17(22)8-10-21(25)28-19/h5-6,8,10-11,14,20,24H,7,9,12-13H2,1-4H3/b15-11+