Internal Standard Back Catalog number: 95665 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 33601 Chlorodifluoromethane Price on request 2903.20-1MG 17beta-Ethynylestradiol,neat,neat,1mg, Price on request 3331.12-100-AC Carbofuran-3-hydroxy, 100µg/mL, Solvent-acetonitrile, Unit 1mL, # of units-1, Cas.no. 16655-82-6 Price on request