InChI=1/C12H10N4O3/c1-2-19-12(18)7(6-13)9-11(17)16-10-8(15-9)4-3-5-14-10/h3-5,15H,2H2,1H3,(H,14,16,17)/b9-7 acetic acid, cyano(3,4-dihydro-3-oxopyrido[2,3-b]pyrazin-2(1H)-ylidene)-, ethyl ester, (2Z)- ethyl (2Z)-cyano(3-oxo-3,4-dihydropyrido[2,3-b]pyrazin-2(1H)-ylidene)acetate