Maytansine, an ansamycin antibiotic originally isolated from the Ethiopian shrub Maytenus serrata, inhibits the assembly of microtubules by binding to tubulin at the rhizoxin binding site.

Neamine tetrahydrochloride is a broad-spectrum aminoglycoside antibiotic with antibacterial, antitumor and neuroprotective activities, inhibits the growth of pancreatic cancer cells, and inhibits the proliferation of oral cancer cells.

Ertapenem sodium is a new long-acting 1-β-methyl carbapenem antibiotic with a broad antibacterial spectrum including common aerobic and anaerobic bacteria and organisms with extended-spectrum β-lactamases.