18H-Dipyrrolo[2,1-c:2',1'-o][1,4,7,10,13,16,19,22,25]oxaoctaazacyclooctacosine 19246-24-3 A-128 Antibiotic 128 L-Proline, L-.beta.-aspartyl-L-seryl-L-threonyl-L-allothreonyl-L-alanylglycyl-trans-3-hydroxy-L-prolyl-erythro-3-hydroxy-L-leucyl-.beta.-methyl-L-tryptophyl-.alpha.,.beta.-didehydro-L-tryptophyl-cis-3-hydroxy-, .beta.1-lactone NSC235069 TELOMYCIN