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Here we describe the LC - MS / MS procedure enabling simultaneous determination of four regioisomers ( 8 - iso prostaglandin F2 alpha , 8 - iso - 15 ( R ) - prostaglandin F2 alpha , 11 beta - prostaglandin F2 alpha , 15 ( R ) - prostaglandin F2 alpha ) in plasma samples collected from mice .
 Chemical: 8 - iso prostaglandin F2 alpha; Chemical: 8 - iso - 15 ( R ) - prostaglandin F2 alpha; Chemical: 11 beta - prostaglandin F2 alpha; Chemical: 15 ( R ) - prostaglandin F2 alpha
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: 8 - iso prostaglandin F2 alpha; Chemical: 8 - iso - 15 ( R ) - prostaglandin F2 alpha; Chemical: 11 beta - prostaglandin F2 alpha; Chemical: 15 ( R ) - prostaglandin F2 alpha