CBC

CBC is cannabichromene. It is the neutral form of CBCA, cannabichromenic acid. In the plant, the enzyme CBCA synthase builds CBCA from CBGA, the same starting compound that leads to THCA and CBDA. On lab sheets CBC usually appears as a minor line, often listed near CBCA.

Fresh flower holds most of this compound in the acid form. Heat and time remove the acid's carboxyl group, a step called decarboxylation, and that converts CBCA into CBC. Labs that split acid and neutral forms report both lines when the levels are high enough to measure. A sheet that shows no CBC may simply mean the level was below the lab's reporting limit.

CBC is one of the minor cannabinoids that standard lab panels commonly include, next to CBG and CBN. It is not another spelling of CBD or CBG; the name points to a separate compound with its own ring arrangement. This page covers the name, the relationship to CBCA, and how both appear on standard lab reports.

See also the Cannabinoids hub and the pages for CBCA and CBGA.