| abstract |
wherein R4 or R5 may contain one or more asymmetric centers, mixing a racemic mixture of enantiomers of a compound, which contains the structure of said formula, in a solvent with a resolution compound with a defined stereospecific, forming a solution, and said resolution agent being able to bind with at least one, but not all, the aforementioned enantiomers forming a precipitate, this containing at least one of the aforementioned enantiomers in a stereospecific form; and collecting the precipitate and purifying it; or collecting the solution containing another of the enantiomers mentioned and recrystallizing the enantiomers contained in said solution |