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The selective blockade of A2 adenosine receptors ( DMPX ) and non - selective blockade of adenosine receptors ( caffeine ) significantly increased the action of amphetamine in the locomotor activity test .
 Chemical: adenosine; Chemical: DMPX; Chemical: adenosine; Chemical: caffeine; Chemical: amphetamine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: adenosine; Chemical: DMPX; Chemical: adenosine; Chemical: caffeine; Chemical: amphetamine