PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 21833390-3 2011 Compound 2 having a I4(1)/a space group exhibits a tetranuclear Co(II) cluster with a cubane topology in which the central Co(II) ion and oxygen atoms from bm occupy the alternate vertices of the cube. Oxygen 138-144 mitochondrially encoded cytochrome c oxidase II Homo sapiens 64-70