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4,6-Dichloro-2,5-diphenylpyrimidine

4,6-Dichloro-2-methylthio-5-phenylpyrimidine

5-Bromo-1,3-dimethyluracil

5-Iodo-6-methyluracil

5-(Chloromethyl)uracil

2-Chloro-4-methoxypyrimidine

5-Bromo-6-methyluracil

5-Bromo-1-(tert-butyldimethylsilyl)-1H-indole

1-(tert-Butoxycarbonyl)-5-chloroindole