adenosine 5'-triphosphate ( atp ) , adenosine 5'-diphosphate ( adp ) , cytidine 5'-triphosphate ( ctp ) , cytidine 5'-diphosphate ( cdp ) and some derivatives activate these receptors , whereas adenosine 5'-monophosphate ( amp ) , cytidine 5'-monophosphate ( cmp ) and other naturally-occurring nucleotides are competitive blockers .
C0001459
adenosine
C0001413
adenosine