27162
Protonation takes place on the aliphatic tetraamine chain , while the acridine nitrogen does not participate to proton binding even at very low pH .
 Chemical: tetraamine; Chemical: acridine; Chemical: 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: tetraamine, acridine, nitrogen 
Answer:
 Chemical: tetraamine; Chemical: acridine; Chemical: nitrogen