InChI=1S/C20H27NO9/c1-21-11(3-2-4-14(21)23)9-13(22)10-5-7-12(8-6-10)29-20-17(26)15(24)16(25)18(30-20)19(27)28/h5-8,11,14-18,20,23-26H,2-4,9H2,1H3,(H,27,28)