CAS 503-38-8 appears in our catalog under these names: Trichloromethyl Chloroformate, Trichloromethyl chloroformate, 98% , Diphosgene, Diphosgene, 99%, Trichloromethyl chloroformate, >= 97.0 &. Offered by: TRC, Thermo Scientific (Alfa Aesar), Biosynth, Thermo Scientific (Acros), Sigma-Aldrich. Available pack sizes: 10g, 50g, 250g, 100g, 10ML, 100ML, 50ML, 5g.