InChI=1S/C18H28O4/c1-2-16(19)12-8-6-7-10-14-17(20)13-9-4-3-5-11-15-18(21)22/h6-8,10,12,14,17,20H,2-5,9,11,13,15H2,1H3,(H,21,22)/b7-6+,12-8+,14-10+