TASK DEFINITION: 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.
PROBLEM: Synthesis and evaluation of 8-oxoadenine derivatives as potent Toll-like receptor 7 agonists with high water solubility.

SOLUTION: 8-oxoadenine

PROBLEM: Multiple enzyme inhibitions by histamine H3 receptor antagonists as potential procognitive agents.

SOLUTION: histamine

PROBLEM: 3-Hydroxypyridin-2-thione as Novel Zinc Binding Group for Selective Histone Deacetylase Inhibition.

SOLUTION:
Zinc

