http://en.wikipedia.org/wiki/HU_210 HU-210 is 100 to 800 times more potent than natural THC from cannabis.
Check this shit out:spliff: THC-V This compound is the most potent of all the reported variants, and it is 500 times more active than THC (effective dose 1/500,000 gm. per kilogram). In this case the alkyl side chain (1',2'-dimethylheptyl) contains seven carbon atoms in a straight chain, with 2 methyl groups attached as branches to the first and second carbon atoms. The first methyl branch (shown as X on the chart) is attached as described for THC-III or IV in reactions (e)(f)(g). The second methyl group (Y) is not attached separately but is an original part of the 2-methylheptanonitrile used in method I, or the 2-bromo-heptane used in method II. (Reference 130) http://www.erowid.org/archive/rhodium/chemistry/thc/index.html
