6α-[[(Chloromethyl)carbonyl]amino]penicillanic acid
6α-[[(Chloromethyl)carbonyl]amino]penicillanic acid ??
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6α-[[(Chloromethyl)carbonyl]amino]penicillanic acid C??? ??, ??, ??
6α-[[(Chloromethyl)carbonyl]amino]penicillanic acid ?? ?? ? ???
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6α-[[(Chloromethyl)carbonyl]amino]penicillanic acid ?? ??
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