Internal Standard Back Catalog number: 93185 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 9844.2-10ML Glyoxylic acid, 50% solution in water, neat, Solvent-neat, Unit 10mL, # of units-1, Cas.no. 298-12-4 Price on request 673085 Lidocaine, 250mg Price on request 678627 Acrolein-2,4-DNPH, 25mg Price on request