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(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
Glyceraldehyde has one chiral center and therefore exists as two different enantiomers with opposite optical rotation: In the D/L nomenclature, either D from Latin Dexter meaning "right", or L from Latin Laevo meaning "left" In the R/S nomenclature, either R from Latin Rectus meaning "right", or S from Latin Sinister meaning "left"
Phenibut is used in Russia, Ukraine, Belarus and Latvia as a pharmaceutical drug to treat anxiety and to improve sleep (e.g., in the treatment of insomnia). [5] [6] It is also used for various other indications, including the treatment of asthenia, depression, alcoholism, alcohol withdrawal syndrome, post-traumatic stress disorder, stuttering, tics, vestibular disorders, Ménière's disease ...
The (R)-enantiomer has the desired sedative effect while the (S)-enantiomer harbors embryo-toxic and teratogenic effects. Attempting to extract solely R -thalidomide does not remove the risk of birth defects, as it was demonstrated that the "safe" R -thalidomide undergoes an in vivo chiral inversion to the "teratogenic" S -thalidomide.
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Esomeprazole is the (S)-(−)-enantiomer (or less specifically the S-isomer) of omeprazole. [11] It works by blocking H + /K +-ATPase in the parietal cells of the stomach. [11] It was patented in 1993 and approved for medical use in 2000. [14] It is available as a generic medication and sold over the counter in several countries.
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