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DL-Cystine (TEST ITEMS) (SPECIFICATIONS) [α]D 20°(Specific rotation) -2~+2° (Assay) ≥99% (Loss on drying) ≤0.5% (Residue on ignition) ≤0.1% (Chloride) ≤0.1% (Heavy metals) ≤10ppm (Iron) ≤5ppm (Srate of solution) ≥98% (Other amino acids)