Oxiracetam is substituted with an additional hydroxy group at R4, which happens to be a chiral Heart for that molecule. Oxiracetam is presumably manufactured for a racemate of its enantiomers. Oxiracetam is structurally analogous to piracetam, which lacks the R4 hydroxy substitution of oxiracetam.Jansen et al. (ninety three) reviewed the efficacy