Hexachlorocyclohexane

Hexachlorocyclohexane (HCH) or 666 is a six chlorine substituted cyclohexane, a polyhalogenated compound. It comes in many forms. Some are pesticides.

Common forms are:

• α-HCH (CAS RN: 319-84-6 ), or α-BCH, alpha-Hexachlorocyclohexane
• β-HCH (CAS RN: 319-85-7 ), or β-BCH, beta-Hexachlorocyclohexane
• γ-HCH (CAS RN: 58-89-9 ), or γ-BCH, gamma-Hexachlorocyclohexane, or Lindane
• δ-HCH (CAS RN: 319-86-8 ), or δ-BCH, delta-Hexachlorocyclohexane
• t-HCH (CAS RN: 608-73-1 ), or t-BCH, technical hexachlorocyclohexane