[gilleain]

It looks like "THC" and "tetrahydrocannabinol" resolve to different isomers. One has wedges (stereo information) and they have different double bond positions (the double lines).

The problem here is naming compounds - a name like "THC" is not precise enough to distinguish between these isomers. A more exact name could be "(–)-trans-Δ⁹-tetrahydrocannabinol" (from wikipedia).

[NTripleOne]

Ah, interesting - thanks. I'll be honest chemistry never really was my strong point (I much preferred the more practical aspect of physics in school) - I try to pick up what I can from creators such as codyslab, nilered, nurdrage, etc, but I guess my attention to it falls in the "interesting but not interested" category, for lack of a better term.