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cyclobutane

n. 1 (context uncountable organic compound English) A simple alicyclic hydrocarbon, C4H8; a light inflammable gas. 2 (context countable organic chemistry English) Any derivative of this compound.

Wikipedia
Cyclobutane

Cyclobutane is a cycloalkane and organic compound with the formula (CH). Cyclobutane is a colourless gas and commercially available as a liquefied gas. Derivatives of cyclobutane are called cyclobutanes. Cyclobutane itself is of no commercial or biological significance, but more complex derivatives are important in biology and biotechnology.