| abstract |
A cef-3-em compound characterized by the formula [I] or a salt or ester thereof, wherein R is selected from the group consisting of a) HOOC-X-CO in which X is defined as (CH2) 4 or where X is (CH2) m-CH> = A- (CH2) not (CH2) mC≡C- (CH2) n, where m and n are each individually 0.1, 2 or 3, and m + n> = 2 or 3, and A is CH or N, or where X is (CH2) p-CH> = CH-CH> = C- (CH2) q, where p and q are each individually 0 or 1, yp + q> = 0, or b) Y-CH2-CO-, in which Y is phenyl, phenoxy or tetrazolyl and in which R 'is selected from the group consisting of c) OH d) O- (alkyl C1-6), where the alkyl can be linear or branched, and e) OC (C1-6 alkyl) -O- (C1-6 alkyl), where the alkyl groups can be linear or branched. |