(E)-6-ethoxy-4-imino-N’-(4-((R)-4-methyl-6-oxo-1,4,5,6-tetrahydropyridazin-3-yl)phenyl)-5-((E)-(4-((R)-4-methyl-6-oxo-1,4,5,6-tetrahydropyridazin-3-yl)phenyl)diazenyl)-1,4-dihydropyrimidine-2-carbohydrazonoylcyanide