PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 17585854-5 2007 The most potent P2X7 receptor antagonist identified in this study (compound 4g) contains an o-fluorine substituent on the phenylpiperazine moiety and had an IC50 of 12.1 nM. phenylpiperazine 122-138 purinergic receptor P2X 7 Homo sapiens 16-29