InChI=1S/C24H38O4/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-20-18-21(25)19-22(26)23(20)24(27)28/h9-10,18-19,25-26H,2-8,11-17H2,1H3,(H,27,28)/b10-9+