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(2007/10/02)trans-3-benzyloxycarbonylamino-4-t-butyloxycarbonylmethylcarbamoylmethyl-2-azetidinone
trans-3-benzyloxycarbonylamino-4-methoxycarbonylmethyl-2-azetidinone
trans-3-benzyloxycarbonylamino-4-carboxymethyl-2-azetidinone
[2-((2S,3S)-3-Amino-4-oxo-azetidin-2-yl)-acetylamino]-acetic acid tert-butyl ester
2-(2-aminothiazol-4-yl)-2-(methoxy)iminoacetic acid