InChI=1S/C21H31O4/c1-11(22)18-17(24)10-15-12-4-5-14-19(25)16(23)7-9-20(14,2)13(12)6-8-21(15,18)3/h5,12-13,15-19,24-25H,4,6-10H2,1-3H3/t12?,13?,15?,16?,17?,18?,19?,20-,21+/m1/s1