4099
In other groups , each atrium was incubated with selective adenosine A ( 1 ) antagonist ( 8 - cyclopentyl - 1 , 3 - dipropylxanthine ( DPCPX ) , 10 ( - 4 ) M ) or selective adenosine A ( 2a ) receptor antagonist ( 8 - ( 3 - chlorostyryl ) caffeine , 10 ( - 5 ) M ) before amitriptyline administration .
 Chemical: adenosine; Chemical: 8 - cyclopentyl - 1 , 3 - dipropylxanthine; Chemical: DPCPX; Chemical: adenosine; Chemical: 8 - ( 3 - chlorostyryl ) caffeine; Chemical: amitriptyline
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: adenosine; Chemical: 8 - cyclopentyl - 1 , 3 - dipropylxanthine; Chemical: DPCPX; Chemical: adenosine; Chemical: 8 - ( 3 - chlorostyryl ) caffeine; Chemical: amitriptyline