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

Structure
PCP is a polychlorinated aromatic:



Degradation
PCP is degraded by some bacteria, including Sphingobium chlorophenolicum.

PCP → TCHQ → TriCHQ → DCHQ → 2,4-dichloro-3-hydroxy-cis,cis-muconic semialdehyde