the predominant circulating folate , 5-methyl tetrahydrofolate , and the clinically useful rescue agent leucovorin ( 5-formyl tetrahydropteroyl-glutamic acid ) do not interfere with the assay , nor does the methotrexate metabolite 4-amino-4-deoxy-10-methylpteroic acid .
C0061472
glutamic acid
C0002520
amino