(2S)-Chroman-2-carboxylic Acid is a chroman-2-carboxamide derivative that exhibits high and selective affinity for the opioid receptor. Also, it is derived from (S)-9-Hydroxy Risperidone-d4 (H953362), which is the S-enantiomer metabolite of Risperidone (R525000), a combined serotonin (5-HT2) and dopamine (D2) receptor antagonist.