InChI=1S/C16H26O7/c1-15(2)7-4-5-16(3,6-7)14(15)23-13-10(19)8(17)9(18)11(22-13)12(20)21/h7-11,13-14,17-19H,4-6H2,1-3H3,(H,20,21)