[{"site":"12ca_1","metals":[{"symbol":"Hg","atom_pdb_number":2030,"name":"Mercury","geometry":"trigonal plane with a vacancy (regular)","residue_pdb_number":263}]},{"site":"12ca_2","metals":[{"symbol":"Zn","atom_pdb_number":2029,"name":"Zinc","geometry":"tetrahedron with a vacancy (regular)","residue_pdb_number":262}]}]