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.

Q: Analysis of NMDA receptors in the human spinal cord.

A: NMDA
****
Q: A novel mutation of the erythroid-specific gamma-Aminolevulinate synthase gene in a patient with non-inherited pyridoxine-responsive sideroblastic anemia.

A: gamma-Aminolevulinate
****
Q: Effect of cyproheptadine on serum leptin levels.

A:
cyproheptadine
****