InChI=1S/C21H32O4/c1-19-7-5-17-15(16(19)6-8-21(19,25)9-10-22)4-3-13-11-14(23)12-18(24)20(13,17)2/h12-13,15-17,22-23,25H,3-11H2,1-2H3/t13?,15-,16-,17-,19-,20-,21-/m0/s1