InChI=1S/C21H32O4/c1-7-12(4)8-19(24)25-18-10-15(11(2)3)21-16(13(18)5)9-17(23)20(21)14(6)22/h8,11,14-16,18,20-22H,5,7,9-10H2,1-4,6H3/b12-8+