PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 26641317-3 2016 The chiral phosphoric acid-catalyzed spiroketalization of deuterium-labeled cyclic enol ethers revealed a highly diastereoselective syn-selective protonation/nucleophile addition, thus ruling out long-lived oxocarbenium intermediates. oxocarbenium 207-219 synemin Homo sapiens 132-135