Hideaki Natsugari," Yasuhiko Kawano, Akira Morimoto, Kouichi Yoshioka, and Michihiko Ochiai Chemistry Laboratories, Central Research Division, Takeda Chemical Industries, Ltd., Yodogawa-ku, Osaka 532, Japan ... Lactivicin, a new type of antibiotic having P-lactam-like activity, and its derivatives were synthesized starting from 4-benzyloxycarbonylamino-3-isoxazolidinones and 2-oxoglutaric acid. ... Lactivicinl (1) { 2-[ (4S)-4-acetamido-3-oxo-2-isoxazolidinyl]- 5- ...