Enzymes that catalyze the cleavage of a carbon-carbon bond by means other than hydrolysis or oxidation. This subclass contains the DECARBOXYLASES, the ALDEHYDE-LYASES, and the OXO-ACID-LYASES. EC 4.1.

Synonyms: Lyases, Carbon-Carbon, EC 4.1.-, Carbon-Carbon Lyases, Carbon Carbon Lyases