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diphenylmethyl 7β-<(E)-4-chloro-2-p-nitrobenzyloxycarbonylmethoxyimino-3-oxobutyramido>-3-vinyl-3-cephem-4-carboxylate
diphenylmethyl 7β-<(E)-2-tert-butoxycarbonylmethoxyimino-2-(2-formamido-4-thiazolyl)acetamido>-3-vinyl-3-cephem-4-carboxylate
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