Compound class
 Carbohydrates
 Lipids
 Nucleic acids
 Peptides
 Phytochemical Compounds
 Vitamins and hormones
Activity
 Antibiotics
 Enzyme Ligands
 Enzyme Substrates
	6. Ligases
		6.3  Forming carbon-nitrogen bonds
			6.3.1  Acid--ammonia (or amine) ligases (amide synthases)
			6.3.2  Acid-D-amino-acid ligases (peptide synthases)
			6.3.4  Other carbon--nitrogen ligases
			6.3.5  Carbon--nitrogen ligases with glutamine as amido-N-donor
 GPCR Ligands
 Ion Channel Ligands
 Nuclear Receptor Ligands
 Transporter Substrates