PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 18386268-5 2008 For example, benzene with the Pbca structure may be described in terms of two types of CH interactions: a longer contact largely of the van der Waals type, and a shorter, structure-determining type (C(delta-)H(delta+)), which we term "n-polar". Benzene 13-20 PBCA Homo sapiens 30-34