the order of potency ( cyclohexyladenosine greater than or equal to r-phenylisopropyl-adenosine greater than n-ethylcarboxamidoadenosine greater than s-phenylisopropyl-adenosine ) suggests an adenosine a1-receptor mediated presynaptic inhibition of noradrenaline release .
C0050789
n-ethylcarboxamidoadenosine
C0001443
adenosine