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A	B	C	D	E	F
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M	N	O	P	Q	R
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5-Bromocytosine

2-Amino-4-piperidino-6-methylpyrimidine

2-Amino-4-phenoxy-6-methylpyrimidine

2-Amino-5-bromo-4-hydroxy-6-phenylpyrimidine

2-Amino-6-fluoro-4-hydrazinopyrimidine

2-Amino-4-fluoro-6-phenoxypyrimidine

2-Amino-4-chloro-6-phenylpyrimidine

2,4-Diamino-6-fluoropyrimidine

2-Amino-6-fluoro-4-methoxypyrimidine

2-Amino-4-hydroxy-6-phenoxypyrimidine

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