.beta.-lactam antibiotics
摘要:
Antibacterially active and animal growth-promoting novel .beta.-lactam compounds of the formula ##STR1## in which R.sup.1 represents the radical ##STR2## Y representing N or CR.sup.9, or Y--R.sup.7 representing ##STR3## Z representing O, S, or NR.sup.10, and R.sup.2 represents hydrogen or a protective group.
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