`[-CH_2-overset(O)overset(||)C-]_n``[-O -UNDERSET(CH_3)underset(|)CH-COO-CH_2-CO-]_n``[-overset(O)overset(||)C-NH-(CH_2)_5-]_n``[CH_2-overset(Cl)overset(|) CH-]_n`
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