Ganetespib (STA-9090) Ganetespib (STA-9090) Synonyms: Ganetespib; 5-[2,4-Dihydroxy-5-(1-methylethyl)phenyl]-2,4-dihydro-4-(1-methyl-1H-indol-5-yl)-3H-1,2,4-triazol-3-one CAS NO.: 888216-25-9 Formula: C20H20N4O3 Weight: 364.3978