Acetylation starts with the main cannabinoid, and only the psychoactive ones have been used, so THC and HHC. The acetate version

(-O) is what’s referred to as a semi-synthetic derivative, or an analogue. Using a chemical catalyst called acetic anhydride, you can turn THC and HHC into THC-O and HHC-O, which are said to be 1.5 times more potent than the original compounds.