1. (a) Shionogi & Co., Ltd Patent, WO 96/04262.
2. (b) Kobayashi, S.; Hidaka, S.; Kawamura, Y.; Ozaki, M.; Hayase, Y. J. Antibiotics in press.
3. (c) Kobayashi, S.; Nakai, H.; Ikenishi, Y.; Sun, W.Y.; Ozaki, M.; Takeda, R.; Hayase, Y. ibid. in press.
4. Synthesis and biological activity of pyochelin, a siderophore of Pseudomonas aeruginosa