InChI=1S/C18H30O4/c1-4-5-6-7-8-9-13-10-11-18(21-13)12-14-15(22-18)17(2,3)16(19)20-14/h13-15H,4-12H2,1-3H3/t13-,14-,15+,18-/m1/s1