InChI=1S/C21H31O4/c1-12(22)21(25)18(24)11-17-15-5-4-13-10-14(23)6-8-19(13,2)16(15)7-9-20(17,21)3/h4,14-18,24-25H,5-11H2,1-3H3/t14?,15?,16?,17?,18?,19-,20-,21+/m0/s1