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A petroleum by-product sometimes used to treat psoriasis. Exactly how it works, however, is unclear.
Coal Tar (Wikipedia)
Coal tar is a brown or black liquid of extremely high viscosity. Coal tar is among the by-products when coal is carbonized to make coke or gasified to make coal gas. Coal tars are complex and variable mixtures of phenols, polycyclic aromatic hydrocarbons (PAHs), and heterocyclic compounds.