PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 9306250-8 1997 5R-penicilloic acid is the first degradation product of ampicillin and subsequently undergoes epimerization at C-5 to form the 5S isomer via the imine tautomer. CHEMBL3739852 127-129 complement C5 Homo sapiens 111-114