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?? ???? >(E)-4-[(S)-1-Benzyl-2-hydroxyethylamino]-4-oxo-2-butenoic acid ethyl ester
(E)-4-[(S)-1-Benzyl-2-hydroxyethylamino]-4-oxo-2-butenoic acid ethyl ester
(E)-4-[(S)-1-Benzyl-2-hydroxyethylamino]-4-oxo-2-butenoic acid ethyl ester ??
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(E)-4-[(S)-1-Benzyl-2-hydroxyethylamino]-4-oxo-2-butenoic acid ethyl ester C??? ??, ??, ??
(E)-4-[(S)-1-Benzyl-2-hydroxyethylamino]-4-oxo-2-butenoic acid ethyl ester ?? ?? ? ???
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(E)-4-[(S)-1-Benzyl-2-hydroxyethylamino]-4-oxo-2-butenoic acid ethyl ester ?? ??
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