^ ab“Novel positive allosteric modulators of sigma-1 receptor”. SpringerPlus4: P51. (2015). doi:10.1186/2193-1801-4-S1-P51. "The R-configuration enantiomers of methylphenylpiracetam are more active positive allosteric modulators of Sigma-1 receptor than S-configuration enantiomers."
^“Stereochemistry of phenylpiracetam and its methyl derivative: improvement of the pharmacological profile”. Chemistry of Heterocyclic Compounds51 (7): 601-606. (2015). doi:10.1007/s10593-015-1747-9. "In conclusion, the obtained data demonstrated that E1R is the most active memory enhancing enantiomer of the 5-methyl-substituted phenylpiracetam homolog, and its cognition enhancing activity is higher than that of (R)-phenylpiracetam."