Technical note
This should be delta-11 THC. This refers to the double bond in one of the rings in the structure.
Consulting the excellent text 'Chemical Aspects of Biosynthesis'' I find that THC is a product of mixed metabolism. Fusion of geranyl pyrophosphate and olivetol(2,4-hydroxy,5-pentylbenzoate) form the skeleton which is cyclised to form the final product.
Although i can't seem to name THC properly (IUPAC nomenclature is horrendous for multiple ring systems) I can give you the SMILE string:
c1c(CCCCC)cc(O)c2c1OC(C)(C){C@@H}3CCC(C)=C{C@@H}23
This should give the correct stereochemistry.