PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 15254639-4 2004 The polyamine was introduced to the C-5 position of uridine via an ethyl tether and the molecule elaborated into a synthon suitable for oligoribonucleotide assembly. Uridine 52-59 complement C5 Homo sapiens 36-39