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: Efficacy and safety of the factor VIII/von Willebrand factor concentrate, haemate-P/humate-P: ristocetin cofactor unit dosing in patients with von Willebrand disease.
Example Output: ristocetin

Example Input: Molecular mechanism regulating 24-hour rhythm of dopamine d3 receptor expression in mouse ventral striatum.
Example Output: dopamine

Example Input: Anti-inflammatory trends of 1, 3-diphenyl-2-propen-1-one derivatives.
Example Output:
1, 3-diphenyl-2-propen-1-one