16174
Spectroscopic study and ( 1 ) H NMR titration experiment revealed that the deprotonation of the hydrogen atom on the N position of uracil moiety by fluoride ions is responsible for the recognition events , evidenced by immediate transformation from the sol phase to the gel state upon adding a small amount of a proton solvent , methanol .
 Chemical: ( 1 ) H; Chemical: hydrogen; Chemical: N; Chemical: uracil; Chemical: fluoride; Chemical: methanol
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: hydrogen; Chemical: N; Chemical: uracil; Chemical: fluoride; Chemical: methanol