27165
In fact , at low pH values , the spectra show a blue - shifted emission , resembling that of unprotonated acridine , while at slightly acidic and alkaline pH the fluorescence features a red - shifted band similar to that of acridinium cation .
 Chemical: acridinium
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: acridinium 
Answer:
 Chemical: acridinium