What are the atoms that are bonded in the molecule TR001 with the bond ID of TR001_2_6?
TR001 is the molecule id; TR001_2_6 is the bond id
SELECT SUBSTR(T.bond_id, 1, 7) AS atom_id1 , T.molecule_id || SUBSTR(T.bond_id, 8, 2) AS atom_id2 FROM bond AS T WHERE T.molecule_id = 'TR001' AND T.bond_id = 'TR001_2_6'