InChI=1S/C13H16N2O8/c14-6-3-4(1-2-5(6)11(15)19)22-13-9(18)7(16)8(17)10(23-13)12(20)21/h1-3,7-10,13,16-18H,14H2,(H2,15,19)(H,20,21)