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Number of new drug classes introduced between 1935 and 2005
a Sulfanomides.
b Penicillins, aminoglycosides, cephalosporins.
c Chloramphenicol, tetracyclines, macrolides, lincosamides, streptograms.
d Glycopeptides, rifamycins.
e Nitroimidiazoles, quinolones.
f Trimethoprim.
gOxazolidinones
hLipopeptides.
