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A	B	C	D	E	F
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M	N	O	P	Q	R
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Penicillin G sodium salt

(4-Pyridylthio)acetic acid

N-(4-Pyridyl)pyridinium chloride hydrochloride

1-(2-Pyridyl)piperazine

D-(-)-Penicillamine

4-Pyridylmercapto acetyl chloride hydrochloride

4-[4-(3-Pyridyl)imidazol-1-yl]butylamine