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: Binding of antipsychotic drugs at alpha 1A- and alpha 1B-adrenoceptors: risperidone is selective for the alpha 1B-adrenoceptors.
Example Output: risperidone

Example Input: Aripiprazole acts as a selective dopamine D2 receptor partial agonist.
Example Output: dopamine

Example Input: Compensatory changes in enzymes of arginine metabolism during renal hypertrophy in mice.
Example Output:
arginine