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: Retigabine, a novel anti-convulsant, enhances activation of KCNQ2/Q3 potassium channels.

SOLUTION: potassium

PROBLEM: Neonatal epileptic encephalopathy caused by mutations in the PNPO gene encoding pyridox(am)ine 5'-phosphate oxidase.

SOLUTION: pyridox(am)ine 5'-phosphate

PROBLEM: Jostling for position: optimizing linker location in the design of estrogen receptor-targeting PROTACs.

SOLUTION:
estrogen