HU-210 is a synthetic cannabinoid that was first synthesized in 1988 from (1R,5S)-myrtenol[2] by a group led by Raphael Mechoulam at the Hebrew University.

[3][4][5] HU-210 is 100 to 800 times more potent than natural THC from cannabis and has an extended duration of action.

[2] HU-210 is not listed in the schedules set out by the United Nations' Single Convention on Narcotic Drugs from 1961 nor their Convention on Psychotropic Substances from 1971,[15] so the signatory countries to these international drug control treaties are not required by said treaties to control HU-210.

[18] A version of the document (updated in 2013), now in PDF form, exists on the DEA Office of Diversion Control's website.

(6aR, 10aR)-9-(hydroxymethyl)-6,6-dimethyl-3-(2-methyloctan-2-yl)-6a,7,10,10a-tetrahydrobenzo[c]chromen-1-ol, some trade or other names: HU-210.HU-210 is a Schedule I controlled substance, categorized as a hallucinogen, making it illegal to buy, sell, or possess in the state of Florida without a license.