hat
Pi itil la konpoze heterocyclic ak bag 4-manm yo se de seri de antibyotik, cephalosporins yo, ak penisilin. Seri de a gen bag azetidinone ki se ke yo rele tou bag beta-lactam.
eng
The most useful heterocyclic compounds with 4-membered rings are two series of antibiotics, the cephalosporins, and penicillins. The two series contain azetidinone ring which is also known as Beta-lactam ring.