InChI=1S/C21H23NO8/c1-3-4-10-13(23)14(24)15-11(2)16(25)20(30-15)18(27)21(29,22-19(20)28)17(26)12-8-6-5-7-9-12/h4-10,13-14,18,23-24,27,29H,3H2,1-2H3,(H,22,28)