Unsaturated - carbon to carbon double bond, alkenes, Hydroxyl - OH, alcohols, Carboxyl - COOH, carboxylic acids (and amino acids), Carbonyl (end) - CHO, aldehydes, Carbonyl (middle) - CO, ketones, Ester (carboxylate) - COOC, ester, Amide (peptide) - CONH, proteins, Amino - NH2, amino acids,

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