THCjd, also known as Δ9-THCjd, is a rare octyl cannabinoid and THC isomer found naturally in all varieties of cannabis, including hemp and marijuana. An octyl cannabinoid means a cannabis compound with an alkyl side chain composed of eight carbon atoms.
This 8-link alkyl side chain is responsible for THCjd’s potential ability to induce a euphoric high that’s 19-times more potent than THC and over 25-times stronger than delta-8 and delta-10. 
Due to its potency, beginner cannabis users should be careful when trying THCjd for the first time.