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?? ???? >(7S)-3-Acetyloxymethyl-7α-methoxycepham-3-ene-4-carboxylic acid tert-butyl ester
(7S)-3-Acetyloxymethyl-7α-methoxycepham-3-ene-4-carboxylic acid tert-butyl ester
(7S)-3-Acetyloxymethyl-7α-methoxycepham-3-ene-4-carboxylic acid tert-butyl ester ??
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(7S)-3-Acetyloxymethyl-7α-methoxycepham-3-ene-4-carboxylic acid tert-butyl ester C??? ??, ??, ??
(7S)-3-Acetyloxymethyl-7α-methoxycepham-3-ene-4-carboxylic acid tert-butyl ester ?? ?? ? ???
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(7S)-3-Acetyloxymethyl-7α-methoxycepham-3-ene-4-carboxylic acid tert-butyl ester ?? ??
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