10-Propargyl-10-deazaaminopterin 146464-95-1 L-Glutamic acid, N-(4-(1-((2,4-diamino-6-pteridinyl)methyl)-3-butynyl)benzoyl)- N-(4-(1-((2,4-Diamino-6-pteridinyl)methyl)-3-butynyl)benzoyl)-L-glutamic acid PDX