Synonyms: D-Alanine,N-[2-[6-ethyltetrahydro-2-hydroxy-5-(3-methylbutyl)-2H-pyran-2-yl]-2-hydroxy-1-oxopropyl]-erythro-3-hydroxy-L-leucyl-D-hexahydro-3-pyridazinecarbonyl-N-hydroxy-L-alanylglycyl-L-hexahydro-3-pyridazinecarbonyl-N-hydroxy-,r-lactone, [2R-[2a,2(S*),5a,6b]]-;13H,22H-Dipyridazino[6,1-f:6',1'-o][1,4,7,10,13,16]oxapentaazacyclononadecine,cyclic peptide deriv.; Antibiotic IC 101; IC 101