Indicate the molecule id is belonging to the TR00_1_2 bond that has the first atom named TR00_1.
SELECT T2.molecule_id, T2.bond_id, T1.atom_id FROM connected AS T1 INNER JOIN bond AS T2 ON T1.bond_id = T2.bond_id WHERE T1.atom_id = 'TR000_1' AND T2.bond_id = 'TR000_1_2'