Toxic, possibly carcinogenic, monomer of neoprene, a synthetic rubber; causes damage to skin, lungs, CNS, kidneys, liver, blood cells and fetuses. Synonym: 2-chlorobutadiene.

Five-carbon saturated hydrocarbon group of the methane series. Include isomers and derivatives.

Four carbon unsaturated hydrocarbons containing two double bonds.

The five-carbon building blocks of TERPENES that derive from MEVALONIC ACID or deoxyxylulose phosphate.