20455
The structures of the target compounds have been characterized by ( 1 ) H NMR , ( 13 ) C NMR , IR , MS and HRMS .
 Chemical: ( 1 ) H; Chemical: ( 13 ) C
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: ( 1 ) H; Chemical: ( 13 ) C