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Benzoylecgonine
Names
	IUPAC name 3β-(Benzoyloxy)tropane-2β-carboxylic acid
	Systematic IUPAC name (1R,2R,3S,5S)-3-(Benzoyloxy)-8-methyl-8-azabicyclo[3.2.1]octane-2-carboxylic acid
Identifiers
CAS Number	519-09-5 ;
3D model (JSmol)	Interactive image;
Beilstein Reference	89637
ChEBI	CHEBI:41001 ;
ChemSpider	395095 ;
DrugBank	DB01515 ;
ECHA InfoCard	100.007.513
EC Number	208-263-5;
KEGG	C10847 ;
PubChem CID	448223;
UNII	5353I8I6YS ;
CompTox Dashboard (EPA)	DTXSID7046758 ;
	InChI InChI=1S/C16H19NO4/c1-17-11-7-8-12(17)14(15(18)19)13(9-11)21-16(20)10-5-3-2-4-6-10/h2-6,11-14H,7-9H2,1H3,(H,18,19)/t11-,12+,13-,14+/m0/s1 Key: GVGYEFKIHJTNQZ-RFQIPJPRSA-N ; InChI=1/C16H19NO4/c1-17-11-7-8-12(17)14(15(18)19)13(9-11)21-16(20)10-5-3-2-4-6-10/h2-6,11-14H,7-9H2,1H3,(H,18,19)/t11-,12+,13-,14+/m0/s1 Key: GVGYEFKIHJTNQZ-RFQIPJPRBD;
	SMILES CN1[C@H]2CC[C@@H]1[C@H]([C@H](C2)OC(=O)c3ccccc3)C(=O)O;
Properties
Chemical formula	C16H19NO4
Molar mass	289.331 g·mol−1
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H301
Precautionary statements	P264, P270, P301+P310, P321, P330, P405, P501
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Benzoylecgonine is the main metabolite of cocaine, formed by the liver and excreted in the urine. It is the compound tested for in most cocaine urine drug screens and in wastewater screenings for cocaine use.

Biochemistry and physiology

Chemically, benzoylecgonine is the benzoate ester of ecgonine. It is a primary metabolite of cocaine,^[1] and is pharmacologically inactive.^[2] It is the corresponding carboxylic acid of cocaine, its methyl ester. It is formed in the liver by the metabolism of cocaine by hydrolysis, catalysed by carboxylesterases, and subsequently excreted in the urine. It is readily synthesised by boiling cocaine freebase in water.^[3]

Urinalysis

Benzoylecgonine is the compound tested for in most substantive cocaine drug urinalyses.

Presence in drinking water

Benzoylecgonine is sometimes found in drinking water supplies. In 2005, scientists found surprisingly large quantities of benzoylecgonine in Italy's Po River and used its concentration to estimate the number of cocaine users in the region.^[4] In 2006, a similar study was performed in the Swiss ski town of Saint-Moritz using wastewater to estimate the daily cocaine consumption of the population.^[5] A study done in the United Kingdom found traces of benzoylecgonine in the country's drinking water supply, along with carbamazepine (an anticonvulsant) and ibuprofen (a common non-steroidal anti-inflammatory drug), although the study noted that the amount of each compound present was several orders of magnitude lower than the therapeutic dose and therefore did not pose a risk to the population.^[6]

Preliminary studies on ecological systems show that benzoylecgonine has potential toxicity issues.^[7] Research is being conducted on degradation options such as advanced oxidation and photocatalysis^[8] for this metabolite in an effort to reduce concentrations in waste and surface waters. At environmentally relevant concentrations, benzoylecgonine has been shown to have a negative ecological impact.^[7]

References

^ Schindler, Charles W; Goldberg, Steven R (2012). "Accelerating cocaine metabolism as an approach to the treatment of cocaine abuse and toxicity". Future Medicinal Chemistry. 4 (2): 163–75. doi:10.4155/fmc.11.181. PMC 3293209. PMID 22300096.
^ Shimomura, Eric T.; Jackson, George F.; Paul, Buddha Dev (2019-01-01), Dasgupta, Amitava (ed.), "Chapter 17 - Cocaine, Crack Cocaine, and Ethanol: A Deadly Mix", Critical Issues in Alcohol and Drugs of Abuse Testing (Second Edition), Academic Press, pp. 215–224, doi:10.1016/b978-0-12-815607-0.00017-4, ISBN 978-0-12-815607-0, S2CID 104375532, retrieved 2020-12-23
^ Findlay SP. The Three-dimensional Structure of the Cocaines. Part I. Cocaine and Pseudococaine. J. Am. Chem. Soc. 1954; 76(11): 2855–2862. doi:10.1021/ja01640a001
^ "Italian river 'full of cocaine'". BBC News. 5 August 2005. Retrieved 11 May 2014.
^ "Tant de coke ? Stupéfiant !". Courrier International (in French). 2 February 2006. Retrieved 11 May 2014.
^ Withnall, Adam (11 May 2014). "Cocaine use in Britain so high it has contaminated our drinking water, report shows". The Independent. Retrieved 11 May 2014.
^ ^a ^b Binelli, A.; Marisa, I; Fedorova, M; Hoffmann, R; Riva, C (2013). "First evidence of protein profile alteration due to the main cocaine metabolite (benzoylecgonine) in a freshwater model". Aquatic Toxicology. 140–141: 268–278. doi:10.1016/j.aquatox.2013.06.013. PMID 23838174.
^ Postigo, C.; Sirtori, C.; Oller, I.; Malato, S.; Maldonado, M.I.; Lopez de Alda, M.; Barcelo, D. (2011). "Solar transformation and photocatalytic treatment of cocaine in water: kinetics, characterization of major intermediate products and toxicity evaluation". Applied Catalysis B: Environmental. 104 (1–2): 37–48. doi:10.1016/j.apcatb.2011.02.030.