Columbia subject headings:
Antibiotics--Synthesis.
Cephalosporins.
Lactams.
Penicillin.
Pharmaceutical chemistry.
Harvard subject headings:
Antibiotics--Synthesis
Cephalosporins
Lactams
Penicillin
Pharmaceutical chemistry
Princeton subject headings:
Antibiotics--Synthesis.
Cephalosporins.
Lactams.
Penicillin.
Pharmaceutical chemistry.