12084
In the present work , we study a high concentrated collagen sample in its soluble , fibrillar , and denatured states using one and two dimensional { ( 1 ) H } - ( 13 ) C solid - state NMR spectroscopy .
 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