|Systematic (IUPAC) name|
|CAS Registry Number|
|Molecular mass||321.413 g/mol|
|(what is this?)|
RCS-4, or 1-pentyl-3-(4-methoxybenzoyl)indole, is a synthetic cannabinoid drug sold under the names SR-19, BTM-4, or Eric-4 (later shortened to E-4), but originally, OBT-199.
RCS-4 is a potent cannabinoid receptor agonist, with EC50 values of 146 nM for human CB1 receptors, and 46 nM for human CB2 receptors. All methoxyphenyl regiosiomers, and N-butyl homologues of RCS-4 and its regiosiomers also display potent agonist activities at CB1 and CB2 receptors.
RCS-4 was banned in Sweden on 1 October 2010 as a hazardous good harmful to health, after being identified as an ingredient in "herbal" synthetic cannabis products. It was outlawed in Denmark on 11 March 2011. In August 2011, New Zealand added not only RCS-4 but also its 1-butyl homologue, and the 2-methoxybenzoyl isomers of both these compounds, to a temporary class drug schedule (i.e. equivalent to Class C but reviewed after 12 months, and with personal possession and use of small amounts decriminalised), which was newly created under the Misuse of Drugs Amendment Act 2011 passed a week earlier.
- = WDU20111050614 "Ustawa z dnia 15 kwietnia 2011 r. o zmianie ustawy o przeciwdziałaniu narkomanii ( Dz.U. 2011 nr 105 poz. 614 )". Internetowy System Aktów Prawnych. Retrieved 12 June 2011.
- Banister, S. D.; Stuart, J.; Conroy, T.; Longworth, M.; Manohar, M.; Beinat, C.; Wilkinson, S. M.; Kevin, R. C.; Hibbs, D. E.; Glass, M.; Connor, M.; McGregor, I. S.; Kassiou, M. (2015). "Structure–activity relationships of synthetic cannabinoid designer drug RCS-4 and its regioisomers and C4 homologues". Forensic Toxicology. doi:10.1007/s11419-015-0282-9.
- Swedish Code of Statutes Regulation (2010:1086).
- Swedish Code of Statutes Regulation (2010:1086). (pdf)
- "Kronic ban passed by Parliament". The New Zealand Herald. NZPA. 4 August 2011. Retrieved 4 November 2011.
- "Synthetic cannabis off shelves by Wednesday". The New Zealand Herald. NZPA. 9 August 2011. Retrieved 4 November 2011.
- New Zealand Gazette. Tuesday 9 August 2011. Issue No 122, pp 3365-3366. Departmental Notices. Health. Misuse of Drugs Act 1975. Temporary Class Drug Notice.
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