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

Smile: O=C(O)C[C@H](NC(C1=CC=C(NCC2=CN=C3C(C(C=C(N)N3)=O)=N2)C=C1)=O)C(NC4=C(N)NC(N)=NC4=O)=O