4578
The key technologies of this device involve controlling the O ( 2 ) content and the temperature of SO ( 2 ) as well as the quantification of sulfur in SF .
 Chemical: O ( 2 ); Chemical: SO ( 2 ); Chemical: sulfur
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: O ( 2 ); Chemical: SO ( 2 ); Chemical: sulfur