11572
Design , synthesis and biological evaluation of novel 7 - mercaptocoumarin derivatives as alpha ( 1 ) - adrenoceptor antagonists .
 7 - mercaptocoumarin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 7 - mercaptocoumarin