Task: Named Entity Recognition
Input (English): Studies on an (S)-2-amino-3-(3-hydroxy-5-methyl-4-isoxazolyl)propionic acid (AMPA) receptor antagonist IKM-159: asymmetric synthesis, neuroactivity, and structural characterization.
Output (English): (S)-2-amino-3-(3-hydroxy-5-methyl-4-isoxazolyl)propionic acid