Calibration Standard Mix 4 Back Catalog number: 53046 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 2540.7-25MG Paraxanthine, neat, Solvent-neat, Unit 25mg, # of units-1, Cas.no. 611-59-6 Price on request 11617.63-100MG Cyanocobalamine, 98% (dry weight basis),neat,neat,100mg, Price on request 1526.24-100-TX5 Coronene-d12, 100µg/mL, Solvent-toluene, Unit 1mL, # of units-5, Cas.no. 16083-32-2 Price on request