InChI=1S/C23H28O4/c1-4-21(18-11-6-5-7-12-18)27-23(25)20-14-8-13-19(16-20)22(24)26-15-9-10-17(2)3/h5-8,11-14,16-17,21H,4,9-10,15H2,1-3H3