NSC140494 Thymidine, uridylyl-(5'-3')-2'-deoxyguanylyl-(5'-3')- thymidylyl-(5'-3')-2'-deoxyguanylyl-(5'-3')-thymidylyl- (5'-3')-2'-deoxyguanylyl-(5'-3')-, 5'-(dihydrogen phosphate), octaammonium salt