`(-underset(O)underset(||)C-NH-(CH_2)_5-)_n` `(-CH_2-CH=CH-CH_2-underset(C_6H_5)underset(|)(CH)-CH_2-)_n` `(-OCH_2-CH_2-O-underset(O)underset(||)C-C_6H_4-overset(O)overset(||)C-)_n``(-NH-(CH_2)_6-NH-CO-(CH_2)_4CO-)_n`
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