[{"site":"12ca_1","metals":[{"symbol":"Hg","atom_pdb_number":2030,"name":"Mercury","pattern":"QX(68)C","residue_pdb_number":263}]},{"site":"12ca_2","metals":[{"symbol":"Zn","atom_pdb_number":2029,"name":"Zinc","pattern":"HX(1)HX(22)H","residue_pdb_number":262}]}]