2682
The comparative po bioavailability in rats was increased by the preadministration of Ko143 ( four - fold ) , MK571 ( two - fold ) and verapamil ( two - fold ) .
 Chemical: Ko143; Chemical: MK571; Chemical: verapamil
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: Ko143; Chemical: MK571; Chemical: verapamil