Provided is a cephem compound which has a wide antimicrobial spectrum, and in particular exhibit potent antimicrobial activity against beta-lactamase producing Gram negative bacteria, and pharmaceutical composition comprising the same.
A Compound of the formula (I):
wherein
W and U are as defined in the specification;
R
1
is as defined in the specification;
R
2A
and R
2B
are as defined in the specification, provided that R
2A
and R
2B
are not taken together to form an optionally substituted oxime group when R
1
is aminothiazole or aminothiadiazole optionally protected at the amino group;
ring A is a benzene ring or a 6-membered aromatic heterocyclic group having 1-3 nitrogen atoms;
R
3
is a hydrogen atom, —OCH
3
or —NH—CH(═O);
k is an integer from 0 to 2;
R
4
is as defined in the specification; and
D and E are as defined in accordance with a) or b) described in the specification.