In this task, you are given a sentence. You are expected to recognize the name of any form of chemical substances. Although there might be several correct answers, you need to write one of them.

Example Input: Rasagiline: a novel anti-Parkinsonian monoamine oxidase-B inhibitor with neuroprotective activity.
Example Output: monoamine

Example Input: 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.
Example Output: (S)-2-amino-3-(3-hydroxy-5-methyl-4-isoxazolyl)propionic acid

Example Input: High-mannose-type glycan modifications of dihydrofolate reductase using glycan-methotrexate conjugates.
Example Output:
dihydrofolate