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C(3)-cyclopropyl cephems and carbacephems.
Spry DO, Snyder NJ, Kasher JS. Spry DO, et al. Among authors: kasher js. J Antibiot (Tokyo). 1989 Nov;42(11):1653-60. doi: 10.7164/antibiotics.42.1653. J Antibiot (Tokyo). 1989. PMID: 2584150 Free article.
3-Quaternary ammonium 1-carba-1-dethiacephems.
Cook GK, McDonald JH 3rd, Alborn W Jr, Boyd DB, Eudaly JA, Indelicato JM, Johnson R, Kasher JS, Pasini CE, Preston DA, et al. Cook GK, et al. Among authors: kasher js. J Med Chem. 1989 Nov;32(11):2442-50. doi: 10.1021/jm00131a006. J Med Chem. 1989. PMID: 2810333
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