InChI=1S/C16H24O7/c1-7(2)16-5-4-15(3,8(16)6-16)23-14-11(19)9(17)10(18)12(22-14)13(20)21/h4-5,7-12,14,17-19H,6H2,1-3H3,(H,20,21)