InChI=1S/C18H34O4/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-18(21)22-16-17(20)15-19/h6-7,17,19-20H,2-5,8-16H2,1H3/b7-6-/t17-/m1/s1