EPA Method 502.2 Internal Standard Back Catalog number: 91703 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 12043.16-10MG Desmethylmirtazapine dihydrochloride,neat,neat,10mg, Price on request 676446 Prochloraz Metabolite BTS40348, 10mg Price on request 51091 Water - Reagent Grade ASTM Type I Price on request