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cyclohexene

n. (context organic compound English) A cyclic hydrocarbon containing six carbon atoms and one double bond; any of its derivatives.

Wikipedia
Cyclohexene

Cyclohexene is a hydrocarbon with the formula CH. This cycloalkene is a colorless liquid with a sharp smell. It is an intermediate in various industrial processes. Cyclohexene is not very stable upon long term storage with exposure to light and air because it forms peroxides.