InChI=1S/C18H26O4/c1-11(17(20)21)6-5-8-18(4)9-7-14-10-15(19)12(2)13(3)16(14)22-18/h10-11,19H,5-9H2,1-4H3,(H,20,21)/t11-,18+/m0/s1