15168
Here , we have perturbed vibrational motions in pentaerythritol tetranitrate reductase ( PETNR ) by isotopic substitution where all non - exchangeable atoms were replaced with the corresponding heavy isotope ( ( 13 ) C , ( 15 ) N , and ( 2 ) H ) .
 Chemical: pentaerythritol tetranitrate; Chemical: ( 13 ) C; Chemical: ( 15 ) N; Chemical: ( 2 ) H
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: pentaerythritol tetranitrate; Chemical: ( 13 ) C; Chemical: ( 15 ) N; Chemical: ( 2 ) H