loop_
    _pdbx_chem_comp_identifier.comp_id
    _pdbx_chem_comp_identifier.identifier
    _pdbx_chem_comp_identifier.type
    _pdbx_chem_comp_identifier.program
    _pdbx_chem_comp_identifier.program_version
     ATP       "adenosine 5'-(tetrahydrogen triphosphate)"
        "SYSTEMATIC NAME" ACDLabs              10.04