`COOH(CH_2)_4COOH+NH_2C_6H_4NH_2``COOH(CH_2)_4COOH+ NH_2(CH_2)_6NH_2``COOH(CH_2)_6COOH+ NH_2(CH_2)_4NH_2``COOHC_6H_4COOH-(p) + NH_2 (CH_2)_6NH_2`
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