Helvolic acid is a steroidal antibiotic compound classified as a fusidane-type nortriterpenoid. It is a tetracyclic steroid acid characterized by a 29-nordammarane skeleton, which is substituted with acetoxy groups at positions C-6 and C-16, oxo groups at C-3 and C-7, and double bonds at C-1, C-17(20), and C-24.
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