(R)-1,2,3,4-Tetrahydro-5-methoxy-N-propyl-2-naphthalenamine L-Tartrate Acid Salt is an intermediate in the production of antipsychotic agents and antiparkinson medications, such as ent-Rotigotine (R700705), which is a non-ergot dopamine agonist drug and is indicated for the treatment of Parkinson’s disease.