InChI=1S/C23H28O5/c1-16(12-8-14-18(3)20-21(28-20)22(24)25)10-6-7-11-17(2)13-9-15-19(4)23(26)27-5/h6-15,20-21H,1-5H3,(H,24,25)/b7-6+,12-8+,13-9+,16-10+,17-11+,18-14+,19-15+