5-Methyltetrahydrohomofolic acid 52196-22-2 52386-42-2 Ketotrexate Ketotrexate [INN] Ketotrexato [Spanish] Ketotrexatum [Latin] N-(4-((2-(2-Amino-1,4,5,6,7,8-hexahydro-5-methyl-4-oxo-6-pteridinyl)ethyl)amino)benzoyl)-L-glutamic acid N-(p-((2-(2-Amino-1,4,5,6,7,8-hexahydro-5-methyl-4-oxo-6-pteridinyl)ethyl)amino)benzoyl)-L-glutamic acid