512-64-1 AIDS-017392 AIDS017392 Echinomycin N-[(11S,24S,1R,4R,7R,14R,17R,20R)-2,5,12,15,18,25-hexaaza-11,24-bis(methylethyl)-2,4,12,15,17,25-hexamethyl-27-methylthio-9,22-dioxa-3,6,10,13,16,19,23,26-octaoxo-20-(quinoxalin-2-ylcarbonylamino)-28-thiabicyclo[12.12.3]nonacos-7-yl]quinoxalin-2-ylcarboxamide NSC526417 Quinomycin A