CGP-27557;21-Acetoxy-5,6,9,17,19-pentahydroxy-23-methoxy-2,4,12,16,18,20-22-heptamethyl-8-(octahydropyrido[1,2-a]pyrazin-2-yliminomethyl)-2,7-(epoxypentadeca-1,11,13-trienimino)naphtho[2,1-b]furan-1,11-dione
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