4-Amino-4-deoxy-N-10-methylpteroyl-(6-diazo-5-oxo)norleucine 82972-54-1 Diazoketone methotrexate L-Norleucine, N-(4-(((2,4-diamino-6-pteridinyl)methyl)methylamino)benzoyl)-6-diazo-5-oxo- Methotrexate diazoketone analog