51264-05-2 Benzenesulfonamide, 4-(((2-amino-1,4,7,8-tetrahydro-4-oxo-6-pteridinyl)methyl)amino)-N-(5-methyl-3-isoxazolyl)- N(1)-3-(5-Methylisoxazolyl)-N(4)-(7,8-dihydro-6-pterinylmethyl)sulfanilamide