Looking for information on the stereoisomers of ethylphenidate. Everything i've read seems to say that the D (dextro) enatiomer of ethylphenidate is the more active isomer.The CAS# on my vendors website is 19716-79-1. Which isomer is this? The limited information available seems to suggest 19716-79-1 this is the S-isomer. I am confused on whether the S-isomer or the R-isomer is the dextrorotary (sp) isomer. Sometimes drugs are also listed as (+) or (-) isomers also? Also when I search for ethylphenidate the most common CAS number for ethylphenidate is 57413-43-1. Is this one the racemate? This molecule [ethylphenidate] also seems to contain 2 stereocenters which would mean there would be four possible isomers much like pseudoephedrine or could be a mix of all these isomers. I am hoping someone can clear this up. Which isomer are these CAS#s, and which isomer did I order? These IUPAC names are confusing to me when there's more than one chiral center.
