consists of only carbon to carbon single bonds
consists of at least one carbon to carbon double bond
consists of at least one carbon to carbon triple bond
contains an -OH group
contains a terminal O=C-H group
contains an internal C=O group
contains a terminal O=C-OH group
contains an internal C-O-C group
contains an internal O=C-O- group
contains a terminal NH2 group
contains an O=C-N group
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