16906
Dipolar edited two - dimensional ( 2D ) ( 1 ) H - ( 15 ) N heteronuclear correlation ( HETCOR ) experiments lead to unambiguous assignments of cross - peaks originating exclusively from ( 1 ) H resonances of water molecules correlating to the protein amide nitrogen .
 Chemical: ( 1 ) H; Chemical: ( 15 ) N; Chemical: ( 1 ) H; Chemical: amide nitrogen
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: ( 1 ) H, ( 15 ) N, ( 1 ) H, amide nitrogen 
Answer:
 Chemical: ( 1 ) H; Chemical: ( 15 ) N; Chemical: ( 1 ) H; Chemical: amide nitrogen