49637-65-2 Dihydropteroyl hexaglutamate L-Glutamic acid, N-(N-(N-(N-(N-(N-(4-(((2-amino-1,4,7,8-tetrahydro-4-oxo-6-pteridinyl)methyl)amino)benzoyl)-L-gamma-glutamyl)-L-gamma-glutamyl)-L-gamma-glutamyl)-L-gamma-glutamyl)-L-gamma-glutamyl)-