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A	B	C	D	E	F
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β-Hydroxynorvaline

Fmoc-L-tert.leucine

DL-3-Methylaspartic acid

DL-2-Methylserine

Acetyl-L-Norleucine

Boc-D-Norleucine

L-Norleucine methyl ester hydrochloride

H-DL-Nle-OMe.HCl

Acrtyl-L-Norvaline

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