15447
Samples were then analysed in SRM mode to detect nicotinic acid and nicotinic acid - d ( 4 ) at m / z 124 --> 80 and 127 --> 84 , respectively .
 Chemical: nicotinic acid; Chemical: nicotinic acid - d ( 4 )
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: nicotinic acid; Chemical: nicotinic acid - d ( 4 )