InChI=1S/C23H28O4/c1-18(12-8-13-20(3)16-17-22(24)25)10-6-7-11-19(2)14-9-15-21(4)23(26)27-5/h6-17H,1-5H3,(H,24,25)/b7-6+,12-8+,14-9+,17-16+,18-10+,19-11+,20-13+,21-15+