InChI=1S/C21H30O6/c1-7-11(2)18(23)26-17-16-12(3)19(24)27-21(16,25-6)10-14-8-9-15(22)13(4)20(14,17)5/h7,13-15,17,22H,8-10H2,1-6H3/b11-7+