1. T. Naohara, F. Natsume, K. Ishii, S. Suzuki, H. Watanabe and O. Ikeda, Japan Patent 86 76 487; April 18, 1986.
2. Chem. Abstr., 106, 18567g (1987).
3. T. Shigematsu, T. Shibahara and E. Hirayama, Japan Patent 79 16 451, February 7, 1979.
4. Chem. Abstr., 91, 39115v (1979).
5. In-vitro activity of new carbapenem antibiotics: comparative studies with meropenem, L-627 and imipenem against pathogenic Nocardia spp.