PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 17177461-4 2006 It appears that commonly cited bond energies for cyclopropane, cyclobutane, and cyclohexane are 3 to 4 kcal mol-1 too small and their pi bond strengths, as given by BDE1 - BDE2, are in error by up to 8 kcal mol-1. cyclopropane 49-61 parathyroid hormone like hormone Homo sapiens 172-176