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.

Troleandomycin (Triacetyloleandomycin), a macrolide antibiotic, is an orally active and specific CYP3A inhibitor that induces mnemonic speech, induces prolonged cholestasis, and can be used in the study of asthma.

2′-C-Methyl-6-O-methylinosine (2′-C-Methyl-6-O-methylinosine) is a hypoxanthine analog exhibiting diverse physical activities for researching various tumor diseases.