Method 1640Mix A Back Catalog number: 52146 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 73303 Glyoxylic acid Price on request 0064.20-200-T Dinaphtho[2,1-b;1',2'-d]furan, 200µg/mL, Solvent-toluene, Unit 1mL, # of units-1, Cas.no. 194-63-8 Price on request H-200N 1,5-Dimethylnaphthalene, 10mg Price on request