twenty to 24 h treatments , using the direct-acting compounds ethyl methanesulfonate , n-methyl-n'-nitro-n-nitrosoguanidine , icr-191 acridine , 5-bromo-2'-deoxyuridine , mitomycin c and high concentrations of thymidine produced positive mutagenic responses , while 2'-deoxyuridine and trifluorothymidine gave negative responses .
C0006233
5-bromo-2
C0011535
deoxyuridine