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?? ???? >(E)-2-[[(Z)-2-[[(Benzyloxy)carbonyl]amino]-2-butenoyl]amino]-2-butenoic acid methyl ester
(E)-2-[[(Z)-2-[[(Benzyloxy)carbonyl]amino]-2-butenoyl]amino]-2-butenoic acid methyl ester
(E)-2-[[(Z)-2-[[(Benzyloxy)carbonyl]amino]-2-butenoyl]amino]-2-butenoic acid methyl ester ??
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(E)-2-[[(Z)-2-[[(Benzyloxy)carbonyl]amino]-2-butenoyl]amino]-2-butenoic acid methyl ester C??? ??, ??, ??
(E)-2-[[(Z)-2-[[(Benzyloxy)carbonyl]amino]-2-butenoyl]amino]-2-butenoic acid methyl ester ?? ?? ? ???
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(E)-2-[[(Z)-2-[[(Benzyloxy)carbonyl]amino]-2-butenoyl]amino]-2-butenoic acid methyl ester ?? ??
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