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PCP
The organochlorine PCP (pentachlorophenol, C6Cl5OH) is a wood preservative biocide:

PCP &rarr; TCH &rarr; TriCHQ &rarr; DCHQ &rarr; 2,4-dichloro-3-hydroxy-cis,cis-muconic semialdehyde

Degradation
PCP is degraded by some bacteria, including Spingobacterium chlorophenolicum