abstract |
PURPOSE: Cephalosporins having a group represented by formula I [where X is O, S or (substituted) imino; B is H, OH, amino, thiol or hydrocarbon residue] at the 3-position or cephalosporins of formula II [where R 1 is (substituted) amino; R 2 is H or lower alkoxy; -COOR 3 represents (ester) carboxyl] are new. n COPYRIGHT: (C)1976,JPO&Japio |