Source:http://linkedlifedata.com/resource/umls/id/C0009137
MSH: A by-product of the destructive distillation of coal used as a topical antieczematic. It is an antipruritic and keratoplastic agent used also in the treatment of psoriasis and other skin conditions. Occupational exposure to soots, tars, and certain mineral oils is known to be carcinogenic according to the Fourth Annual Report on Carcinogens (NTP 85-002, 1985) (Merck Index, 11th ed).,NCI: A dark brown or black thick liquid obtained by roasting pine wood or formed as a by-product in the production of coke. Coal tar is a complex mixture of organic substances, including benzene, phenols, sulfur, aniline, toluene, xylene, naphthalene, anthracene and phenanthrene. This substance is used to treat certain skin diseases, especially psoriasis, and is used in the synthesis of dyes, drugs, explosives, flavorings, perfumes, preservatives, synthetic resins, paints and stains. Coal tar exposure leads to an increased risk of developing cancer of skin, lung, bladder, kidney and digestive tract as well as leukemia. It is