InChI=1S/C21H34O4/c1-3-4-5-6-10-13-16-19-21(25-19)18(22)15-12-9-7-8-11-14-17-20(23)24-2/h7-8,10,12-13,15,18-19,21-22H,3-6,9,11,14,16-17H2,1-2H3/b8-7-,13-10-,15-12-/t18-,19+,21+/m1/s1