8319
The rotational correlation time tau ( c ) for PF ( 6 ) ( - ) rotation follows the sequence gamma - phase < alpha - phase =~ liquid < beta - phase .
 Chemical: PF ( 6 ) ( - )
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: PF ( 6 ) ( - ) 
Answer:
 Chemical: PF ( 6 ) ( - )