31823-54-8 4-Aminofolic acid sodium salt 4-Aminopteroylglutamic acid sodium salt 58602-66-7 7551-06-6 Aminopterin sodium Aminopterin sodium [INN:BAN:DCF] L-Glutamic acid, N-(4-((2,4-diamino-6-pteridinyl)methyl)amino)benzoyl)-, disodium salt