exam
alcohol (carbon-oxygen)
aldehyde (carbon-oxygen)
ketone (carbon-oxygen)
carboxylic acid (carbon-oxygen)
ether (carbon-oxygen)
acid anhydride (carbon-oxygen)
sulfhydryl group (carbon-sulfur)
disulfide (carbon-sulfur)
amino group (carbon-nitrogen)
, Quaternary Amine (carbon-nitrogen)
Phosphoester
Ester
Thioester
Amide
aliphatic
molecule without benzene ring
aromatic
molecule with benzene ring
Proline
Alanine