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?? ???? >(+)-3-[[(R)-2,4-Di(acetyloxy)-3,3-dimethyl-1-oxobutyl]amino]propanoic acid ethyl ester
(+)-3-[[(R)-2,4-Di(acetyloxy)-3,3-dimethyl-1-oxobutyl]amino]propanoic acid ethyl ester
(+)-3-[[(R)-2,4-Di(acetyloxy)-3,3-dimethyl-1-oxobutyl]amino]propanoic acid ethyl ester ??
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(+)-3-[[(R)-2,4-Di(acetyloxy)-3,3-dimethyl-1-oxobutyl]amino]propanoic acid ethyl ester C??? ??, ??, ??
(+)-3-[[(R)-2,4-Di(acetyloxy)-3,3-dimethyl-1-oxobutyl]amino]propanoic acid ethyl ester ?? ?? ? ???
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(+)-3-[[(R)-2,4-Di(acetyloxy)-3,3-dimethyl-1-oxobutyl]amino]propanoic acid ethyl ester ?? ??
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