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The ideal kinetic resolution is that in which only one enantiomer reacts, i.e. k R >>k S. The selectivity (s) of a kinetic resolution is related to the rate constants of the reaction of the R and S enantiomers, k R and k S respectively, by s=k R /k S, for k R >k S. This selectivity can also be referred to as the relative rates of reaction.
Esketamine, sold under the brand names Spravato (for depression) and Ketanest (for anesthesia) among others, [10] [12] is the S(+) enantiomer of ketamine. [5] [13] It is a dissociative hallucinogen drug used as a general anesthetic and as an antidepressant for treatment of depression.
(S,S)-(+)-Ethambutol is powerful and selective antitubercular drug.It is a typical example of an old drug that was introduced for clinical use in its unichiral form. . Ethambutol contains two constitutionally symmetrical chiral centers in its structure and exists in three stereoisomeric forms, the enantiomeric pair (+)-(S,S)- and (−)-(R,R)-ethambutol, along with the achiral stereoisomer called m
On a case-by-case basis, the U.S. Food and Drug Administration (FDA) has allowed single enantiomers of certain drugs to be marketed under a different name than the racemic mixture. [3] Also case-by-case, the United States Patent Office has granted patents for single enantiomers of certain drugs.
Later in late 1970s studies indicated that the (R)- enantiomer is an effective sedative, the (S)-enantiomer harbors teratogenic effect and causes fetal abnormalities. [ 53 ] [ 54 ] [ 55 ] Later studies established that under biological conditions the ( R) -thalidomide, good partner, undergoes an in vivo metabolic inversion to the ( S ...
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The two enantiomers of diphenidine differ greatly in their ability to block the NMDA receptor, with the more potent (S)-enantiomer possessing affinity forty times higher than the (R)-enantiomer. [6] Since diphenidine's introduction in 2013 vendors have stated the drug "acts on dopamine transport" yet no data concerning the action of diphenidine ...
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