10858
Monocyclic beta - lactams as antibacterial agents : facing antioxidant activity of N - methylthio - azetidinones .
 Chemical: Monocyclic beta - lactams; Chemical: N - methylthio - azetidinones
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Monocyclic beta - lactams; Chemical: N - methylthio - azetidinones