(2R,3S)-E1R (Compound 2c) is an enantiomer of E1R. (2R,3R)-E1R is a sigma-1 receptor positive allosteric modulator for the treatment of cognition memory disorders.
(2S,3S)-E1R (Compound 2d) is an enantiomer of E1R. (2R,3R)-E1R is a sigma-1 receptor positive allosteric modulator for the treatment of cognition/memory disorders.
(Rac)-E1R is the racemate of E1R. (Rac)-E1R is a sigma-1 receptor positive allosteric (Sig1R PAM) modulator of for the treatment of cognition/memory disorders.