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.

Ex Input:
Comprehensive review of rasagiline, a second-generation monoamine oxidase inhibitor, for the treatment of Parkinson's disease.

Ex Output:
monoamine


Ex Input:
Exploring the Interplay Between Ligand Derivatisation and Cation Type in the Assembly of Hybrid Polyoxometalate Mn-Andersons.

Ex Output:
Polyoxometalate


Ex Input:
Determination of dimethylarginine dimethylaminohydrolase activity in the kidney.

Ex Output:

dimethylarginine