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.

Input: Consider Input: Cereblon is a direct protein target for immunomodulatory and antiproliferative activities of lenalidomide and pomalidomide.

Output: lenalidomide


Input: Consider Input: 2-Hydroxychalcone and xanthohumol inhibit invasion of triple negative breast cancer cells.

Output: xanthohumol


Input: Consider Input: Molecular recognition of histidine tRNA by histidyl-tRNA synthetase from hyperthermophilic archaeon, Aeropyrum pernix K1.


Output: histidine