L-Cystine Back Catalog number: 72923 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 666 Fentanyl impurity A, 25mg Price on request 1546.14-K-IOX5 n-Tetradecane-d30, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-5, Cas.no. 204244-81-5 Price on request 3363.14-K-ME 2,4'-DDT Price on request