C14H13N2O5 Assay 98%-102% Specific rotation +14.50_+16.50 Transmittance NLT 95% Residue on ignition NMT 0.2% L-a-Aspartyl-L-Phenylalanine NMT 0.25% L-Phenylalanine NMT 0.50% Other related impurities NMT 2.0% 5-benzyl-3.6-dioxo-2-piperazineacetic acid NMT 1.5% Loss on Drying NMT 4.5% PH 4.5-6.0 Heavy metals NMT 10ppm Arsenic(As) NMT 3ppm