InChI=1/C18H20N4O5/c1-21-16-14(17(23)22(2)18(21)24)19-13(20-16)7-6-10-8-11(25-3)15(27-5)12(9-10)26-4/h6-9H,1-5H3,(H,19,20)/b7-6+/f/h19H EF295981B2A2833F