Bisphenol A (BPA) is reported as an environmental endocrine disrupting chemical that affects reproduction in wildlife. BPA is a monomer of polycarbonate plastics and forms an important constituent of epoxy and polystyrene resins, used in the food packing industry. Effect of bisphenol A bis(chloroformate) on conversion of 3T3-L1 fibroblasts to adipocytes is reported.