InChI=1S/C20H24O4/c1-13(8-15-4-6-17(21)19(10-15)22-3)14(2)9-16-5-7-18-20(11-16)24-12-23-18/h4-7,10-11,13-14,21H,8-9,12H2,1-3H3/t13-,14+/m0/s1