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Hydrothermal treatment of racemic atropisomeric ligand diethyl (R,S)-7,7′-dimethyl-4,4′-biquinoline-3,3′-dicarboxylate (DDBD) in the presence of pyridine over 4 days at 140 ℃ with Zn(OAc)2 offers zinc coordination polymer {Zn(DBD)(pyridine)2(H2O)}n{Zn(DBD