Optochin

Optochin

Names
IUPAC name (4β,8α,9R)-6'-Ethoxy-10,11-dihydrocinchonan-9-ol
Other names Ethylhydrocupreine
Identifiers
CAS Number	522-60-1 Y
3D model (JSmol)	Interactive image
ChEBI	CHEBI:86455 N
ChEMBL	ChEMBL534999 N
ChemSpider	79283 N
ECHA InfoCard	100.007.577
MeSH	Optochin
PubChem CID	71542
UNII	4W030VS2OG Y
CompTox Dashboard (EPA)	DTXSID50893924
InChI InChI=1S/C21H28N2O2/c1-3-14-13-23-10-8-15(14)11-20(23)21(24)17-7-9-22-19-6-5-16(25-4-2)12-18(17)19/h5-7,9,12,14-15,20-21,24H,3-4,8,10-11,13H2,1-2H3/t14-,15-,20-,21+/m0/s1 N Key: SUWZHLCNFQWNPE-LATRNWQMSA-N N InChI=1/C21H28N2O2/c1-3-14-13-23-10-8-15(14)11-20(23)21(24)17-7-9-22-19-6-5-16(25-4-2)12-18(17)19/h5-7,9,12,14-15,20-21,24H,3-4,8,10-11,13H2,1-2H3/t14-,15-,20-,21+/m0/s1 Key: SUWZHLCNFQWNPE-LATRNWQMBV
SMILES CC[C@H]1CN2CC[C@H]1C[C@H]2[C@@H](c3ccnc4c3cc(cc4)OCC)O
Properties
Chemical formula	C21H28N2O2
Molar mass	340.46 g/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

Optochin (or ethylhydrocupreine hydrochloride) is a derivative of quinine introduced in 1911 by Morgenroth and Levy with the intention to treat pneumococci infection.^[1] In very high dilutions, it inhibits the growth of representatives of all four groups of pneumococci in vitro. That is the main reason it is now used in bacteriology for the differentiation of Streptococcus pneumoniae, which is optochin-sensitive, from the other, resistant alpha-hemolytic streptococci, sometimes called the viridans streptococci because of the green colouration on blood agar around colonies.

The growth of bacteria that are optochin-sensitive will show a zone of inhibition around an optochin disc, while the growth of bacteria that are resistant to optochin will not be affected. In vitro, a minimum inhibitory concentration (MIC) of 1:10,000,000 will inhibit the growth of pneumococci, and 1:500,000 is bactericidal.^[2]