Does bond id TR001_1_8 have both element of chlorine and carbon?
chlorine refers to element = 'cl'; carbon refers to element = 'c'
SELECT T2.bond_id, T2.atom_id2, T1.element AS flag_have_CaCl FROM atom AS T1 INNER JOIN connected AS T2 ON T2.atom_id = T1.atom_id WHERE T2.bond_id = 'TR001_1_8' AND (T1.element = 'c1' OR T1.element = 'c')