Folinic Acid Impurity 9

Chemical Name: monocalcium(I) mono((4-((((S)-2-amino-5-formyl-8-nitroso-4-oxo-1,4,5,6,7,8-hexahydropteridin-6-yl)methyl)amino)benzoyl)-L-glutamate) , N-Nitroso-Calcium levofolinate-1

Smile: O=C([H])N([C@@]([H])(CNC1=CC=C(C(N[C@](CCC([O-])=O)([H])C([O-])=O)=O)C=C1)CN2N=O)C3=C2NC(N)=NC3=O.[Ca+]