Q: Is it possible to get a patent on a single stereoisomer (e.g., a L-enantiomer) of a compound when the racemate is already known? A: Yes. It is possible. But claiming a single stereoisomer may be challenging without sufficient supporting experimental details. Critical support for arguing non-obviousness: Leading Supreme Court case on Obviousness: KSR Inter- … Continue reading Obviousness of Stereoisomers & Purified Compounds