22731
The most readily absorbable form of nicotine ( unprotonated nicotine ) varied more than 350 - fold , ranging from 0 . 01 to 3 . 7mg / g .
 Chemical: nicotine; Chemical: nicotine
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: nicotine; Chemical: nicotine