Δ9-THC (tetrahydrocannabinol)

The primary psychoactive cannabinoid in cannabis, formed by decarboxylation of THCA. Molecular formula C21H30O2, MW 314.46 g/mol. The 0.3% dry-weight threshold under the USDA Farm Bill 2018 and EU regulations is measured against this compound (plus its THCA precursor in the total THC calculation).