20298
By modifying the formulation parameters , including actuator orifice , HFA and metering volumes , it was possible to produce two formulations ( glycerol - free and glycerol - containing ) which had identical mass median aerodynamic diameters ( 2 . 4 mu m +/- 0 . 1 and 2 . 5 mu m +/- 0 . 2 ) , fine particle dose ( >= 5 mu m ; 66 mu g +/- 6 and 68 mu g +/- 2 ) and fine particle fractions ( 28 % +/- 2 % and 30 % +/- 1 % ) , respectively .
 Chemical: HFA; Chemical: glycerol; Chemical: glycerol
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: HFA; Chemical: glycerol; Chemical: glycerol