L-γ-Glutamyl-3-carboxy-4-nitroanilide ammonium salt(Glupa-C) is white to yellowish crystalline powder used as a substrate for γ-glutamyltransferase (GGT) with a purity of ≥99.6 area% (HPLC). It ensures hi-precision and timely performance for IVD kits. Its supplied in 100g, 500g, 1kg, 5kg, 10kg, with customized packing available upon request.