InChI=1S/C21H21NO9/c23-14(10-4-2-1-3-5-10)13-7-6-12-11(8-9-22(12)13)20(29)31-21-17(26)15(24)16(25)18(30-21)19(27)28/h1-7,11,15-18,21,24-26H,8-9H2,(H,27,28)/t11?,15-,16-,17+,18-,21-/m1/s1