2-amino-4-chloro-5-nitro-6-methylpyrimidine
2-di-N,N-benzyl-6-O-benzyl-7-N-benzyloxymethyl-9-bromo-9-deazaguanine
6-O-benzyl-7-N-benzyloxymethyl-9-bromo-9-deazaguanine
2-amino-4-benzyloxy-5-N-benzyloxymethylpyrrolo[3,2-d]pyrimidine
4-benzyloxy-2-[(di-N,N-methylamino)methylene]amino-6-[2-(N,N-dimethylamino)vinyl]-5-nitropyrimidine