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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

PCPC→TCHQ triCHQ DCHQ 2,4dichloro -3-hydroxy-cis,cis-muconic semialdehyde