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

Structure
PCP is a polychlorinated aromatic:

Degradation
PCP is degraded by some bacteria, including Sphingobacterium chlorophenolicum

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