Folic Acid Impurity 1

Chemical Name: (S)-3-(4-(((6-amino-8-oxo-5,8-dihydropyrido[2,3-b]pyrazin-2-yl)methyl)amino)benzamido)-4-((2,6-diamino-4-oxo-1,4-dihydropyrimidin-5-yl)amino)-4-oxobutanoic acid