abstract |
PURPOSE: 7;C-Amino-3-halogeno-3-thiomethycepham derivatives of formula I (R 1 is acylamido, acylimido; R 2 , in combination with the carbonyl, is ester, acid anhydride, amide, hydrazide; R 3 is monovalent org. radical); for example, 7β-phenoxyacetamido-3-cl-3-phenylthiomethylcepham-4-carboxylic acid methyl ester. n COPYRIGHT: (C)1977,JPO&Japio |