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: Preclinical and clinical development of the oral multikinase inhibitor sorafenib in cancer treatment.

SOLUTION: sorafenib

PROBLEM: Sunitinib, sorafenib and mTOR inhibitors in renal cancer.

SOLUTION: sorafenib

PROBLEM: Glutamate stimulates glutamate receptor interacting protein 1 degradation by ubiquitin-proteasome system to regulate surface expression of GluR2.

SOLUTION:
glutamate