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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-Nitro-2-pentanone

5-Nitroindole-2-carboxylic acid

6-Nitroindoline

5-Nitroisophthalic acid

5-Nitroisoquinoline

4-Nitro-2,3-lutidine-N-oxide

4-Nitro-N-methylphthalimide