Δ11-Tetrahydrocannabinol
Δ11-Tetrahydrocannabinol (delta-11-THC, exo-THC, Δ11-THC, Δ9(11)-THC, exo-tetrahydrocannabinol) is a rare isomer of tetrahydrocannabinol (Δ9-THC), developed in the 1970s. It can be synthesized from Δ8-THC by several different routes, though only the (6aR, 10aR) enantiomer is known.