Butanamide, N-[(1S,7S,10S,27aS)-16,18-dichloro-7,8,9,10- tetrahydro-10-(1-methylethyl)-8-oxo-6H,19H-14,17-epoxy-~ 3,5-etheno-1,23,27-(iminomethyno)-13,11-nitrilo-1H-furo~ [3',4':10,11][1,4]oxaazacyclododecino[12,11-g]pyrrolo[2,3,4~ -rs][4]benzazacyclopentadecin-7-yl]-2-hydroxy-3-methyl-, (2S)- Diazonamide A NSC700089