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: Beta 2- but not beta 1-adrenoceptors are involved in desipramine enhancement of aggressive behavior in long-term isolated mice.

Output: desipramine


Input: Consider Input: Analysis of coenzyme binding by human placental 3 beta-hydroxy-5-ene-steroid dehydrogenase and steroid 5----4-ene-isomerase using 5'-[p-(fluorosulfonyl)benzoyl]adenosine, an affinity labeling cofactor analog.

Output: 3 beta-hydroxy-5-ene-steroid


Input: Consider Input: Enhanced beta cell function and anti-inflammatory effect after chronic treatment with the dipeptidyl peptidase-4 inhibitor vildagliptin in an advanced-aged diet-induced obesity mouse model.


Output: vildagliptin