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: Trichostatin A inhibits transforming growth factor--induced reactive oxygen species accumulation and myofibroblast differentiation via enhanced NF-E2-related factor 2-antioxidant response element signaling.
Example Output: oxygen

Example Input: Anti-apoptotic cardioprotective effects of SHP-1 gene silencing against ischemia-reperfusion injury: Use of deoxycholic acid-modified low molecular weight polyethyleneimine as a cardiac siRNA-carrier.
Example Output: polyethyleneimine

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