Delta9-tetrahydrocannabinolic acid (Δ9-THCA)
Molecular Formula: C22H29O4
Image credit: PubChem
Δ9-THCA was first identified in 1964.
The carboxylic acidic precursor of Δ9-THC is Δ9-THCA.
Isolation, Structure, and Partial Synthesis of an Active Constituent of Hashish
Y. Gaoni , R. Mechoulam
J. Am. Chem. Soc., 1964, 86 (8), pp 1646–1647
Publication Date: April 1964
Δ9-THCA is normally decarboxylated to Δ9-THC by heating or burning.