4-[(2,4-diaminopteridin-6-ylmethyl)methylamino]benzoic acid
Nα-(4-amino-4-deoxy-N10-methylpteroyl)-L-lysine
Nα-(4-amino-4-deoxy-N10-methylpteroyl)-Nε-carbobenzoxy-L-lysine
Nα-(4-amino-4-deoxy-N10-methylpteroyl)-Nε-carbobenzoxy-L-lysine methyl ester
Nα-(4-amino-4-deoxy-N10-methylpteroyl)-Nε-(iodoacetyl)-L-lysine