PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 19879151-2 2009 The 4"-thio analogue (5h) of IB-MECA showed extremely high binding affinity (K(i)=0.25 nM) at the human A(3)AR and was more potent than IB-MECA (K(i)=1.4 nM). 5h 22-24 adenosine A3 receptor Homo sapiens 104-110