19148
( 1 ) H and ( 13 ) C NMR analysis of 2 - acetamido - 3 - mercapto - 3 - methyl - N - aryl - butanamides and 2 - acetamido - 3 - methyl - 3 - nitrososulfanyl - N - aryl - butanamide derivatives .
 Chemical: ( 1 ) H; Chemical: ( 13 ) C; Chemical: 2 - acetamido - 3 - mercapto - 3 - methyl - N - aryl - butanamides; Chemical: 2 - acetamido - 3 - methyl - 3 - nitrososulfanyl - N - aryl - butanamide
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; Chemical: 2 - acetamido - 3 - mercapto - 3 - methyl - N - aryl - butanamides; Chemical: 2 - acetamido - 3 - methyl - 3 - nitrososulfanyl - N - aryl - butanamide