creosote: a dark oily liquid obtained by distillation of coal tar; used as a preservative for wood
organic compound: any compound of carbon and another element or a radical
alpha receptor: receptors postulated to exist on nerve cell membranes of the sympathetic nervous system in order to explain the specificity of certain agents that affect only some sympathetic activities (such as vasoconstriction and relaxation of intestinal muscles and contraction of smooth muscles)