InChI=1S/C24H28O4/c1-15-12-19(25)22-23(2,3)10-5-11-24(22,4)18(15)14-27-17-8-6-16-7-9-21(26)28-20(16)13-17/h6-9,12-13,18,22H,5,10-11,14H2,1-4H3