2', 3'-Didehydro-2', 3'-dideoxy-5-methyluridine-7-[2-[N-(6-aminooctyl)-amino]-5-methyl-imidazo[1,5-b]pyridazin-7-yl]-1-phenyl-1-heptanone heterodimer 210469-31-1 AIDS-081440 AIDS081440 Thymidine, 2',3'-didehydro-3'-deoxy-.alpha.-[[8-[[5-methyl-7-(7-oxo-7-phenylheptyl)imidazo[1,5-b]pyridazin-2-yl]amino]octyl]amino]-