Ethyl (1Z)-N-[[2-[4-[[(4-fluorophenyl)methyl]carbamoyl]-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidin-2-yl]propan-2-yl]oxamoyl]ethanehydrazonate (as per EP); Ethyl (Z)-N-{2-[(2-{4-[(4-fluorobenzyl)carbamoyl]-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidin-2-yl}propan-2-yl)amino]-2-oxoacetyl}acetohydrazonate (as per USP)
