Organic acids

 Lipids

 Carbohydrates

 Nucleic acids

 Peptides

 Vitamins and cofactors

 Steroids

 Hormones and transmitters

 Antibiotics

   beta-Lactams [Fig]

     Penams

     Cephems

     Clavams

     Carbapenems

     Monobactams

   Aminoglycosides [Fig]

   Polyketides and nonribosomal peptides [Fig]

   Quinolones [Fig]

   Others [Fig]