26450
The thermodynamic behavior of the system H2O / BSA was studied at 25 degrees C within the entire composition range : vapor pressure measurements via head space sampling gas chromatography demonstrate that the attainment of equilibria takes more than one week .
 Chemical: H2O
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: H2O