19522
Computed G4 heats of formation values are equal to - 290 , 265 and - 451 kJ mol ( - 1 ) for gaseous neutral histidine and its protonated and deprotonated forms , respectively .
 Chemical: histidine
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: histidine