InChI=1S/C15H16Cl2N2O7/c1-8(20)25-7-12(18-15(22)14(16)17)13(26-9(2)21)10-3-5-11(6-4-10)19(23)24/h3-6,12-14H,7H2,1-2H3,(H,18,22)/t12-,13-/m1/s1