Analysis of technical pentachlorophenol (PCP) shows the presence of numerous chlorinated byproducts which arise in the manufacturing process.'The potential health hazards from exposure to these chemicals is of some concern. It has been shown, for example, that nonachloro-3-phenoxyphenol (I), a contaminant of PCP, 2 has a hemolytic potency at least a hundred times greater than that of PCP, 3 and the need for evaluating other toxicological ...