8219
The reaction was efficiently catalyzed in one - pot by a few drops of HCl in EtOH under reflux conditions providing the title compounds in moderate to high yields .
 HCl, EtOH
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 HCl, EtOH