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A	B	C	D	E	F
G	H	I	J	K	L
M	N	O	P	Q	R
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N-Acetyl-L-leucine

N-Acetyl-D-leucine

N-Acetyl-L-isoleucine

1-Acetyl-1H-indole-2,3-dione

1-Acetyl-2-imidazolidinone

2-Amino-4-hydroxy-6-phenylpyrimidine