loop_ _geom_contact.atom_site_id_1 _geom_contact.atom_site_id_2 _geom_contact.dist _geom_contact.dist_esd _geom_contact.site_symmetry_1 _geom_contact.site_symmetry_2 _geom_contact.publ_flag O(1) O(2) 2.735 0.003 1_555 1_555 yes H(O1) O(2) 1.82 . 1_555 1_555 no