Type Substrate

21 - Analogue of substrate
22 - Angiotensin-converting enzyme inhibitor
23 - Angiotensin-receptor blocker
24 - Anilide
25 - Anthelmintic
26 - Antibiotic
27 - Antioxidant
28 - Antiplatelet
29 - Arachidonate
30 - Aromatic ester (two rings)