InChI=1S/C33H52O4/c1-27(22-23-30-29(3)19-16-25-33(30,4)5)17-15-18-28(2)24-26-37-32(36)21-14-12-10-8-6-7-9-11-13-20-31(34)35/h15,17-18,22-24H,6-14,16,19-21,25-26H2,1-5H3,(H,34,35)/b18-15?,23-22+,27-17?,28-24?