AGN-1135 is a monoamine oxidase inhibitor (MAOI) that was never marketed. It is the racemic form of rasagiline and is a mixture of the R(+)-enantiomer and S(–)-enantiomer (TVP-1022). Like rasagiline, AGN-1135 is a selective monoamine oxidase B (MAO-B) inhibitor. Virtually all of the MAOI activity of AGN-1135 lies in rasagiline, which is several orders of magnitude more potent as an MAO-B inhibitor than the S(–)-enantiomer. In relation to this, enantiopure rasagiline was developed and marketed for use as a pharmaceutical drug rather than AGP-1135.