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functional group priority in nomenclature
carbonyl suffix highest priority
-oic acid
aldehyde suffix highest priority
-al
aldehyde prefix lowest priority
oxo-
ketone suffix highest priority
-one
ketone prefix lower priority
oxo-
alcohol suffix highest priority
-ol
alcohol prefix lowest priority
hydroxy-
amino suffix highest priority
-amine
amino prefix lowest priority
amino-

sulfhydryl suffix highest priority
-thiol

sulfhydryl prefix lower priority
mercapto-