17890
Electronic transitions of protonated and deprotonated amino acids in aqueous solution in the region 145 - 300 nm studied by attenuated total reflection far - ultraviolet spectroscopy .
 Chemical: amino acids
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: amino acids