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