8721
Consideration of the spatial position of Ser - 130 and Lys - 234 and this hydrogen - bonding network will be important in the design of novel antibiotics targeting IR beta - lactamases .
 Chemical: Ser; Chemical: Lys; Chemical: hydrogen
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: Ser; Chemical: Lys; Chemical: hydrogen