The present invention is directed to compounds which are beta-lacatamase inhibitors. The compounds and their pharmaceutically acceptable salts, are useful in combination with beta-lactam antibiotics, or alone, for the treatment of bacterial infections, including infections caused by drug resistant organisms, including multi-drug resistant organisms. The present invention includes compounds according to formula (Ia):
or a pharmaceutically acceptable salt thereof, wherein the values of R
1
, R
2
, R
3
and R
4
are described herein.
The present invention is directed to compounds which are beta-lacatamase inhibitors. The compounds and their pharmaceutically acceptable salts, are useful in combination with beta-lactam antibiotics, or alone, for the treatment of bacterial infections, including infections caused by drug resistant organisms, including multi-drug resistant organisms. The present invention includes compounds according to formula (Ia):
or a pharmaceutically acceptable salt thereof, wherein the values of R
1
, R
2
, R
3
and R
4
are described herein.
The present invention is directed to compounds which are beta-lacatamase inhibitors. The compounds and their pharmaceutically acceptable salts, are useful in combination with beta-lactam antibiotics, or alone, for the treatment of bacterial infections, including infections caused by drug resistant organisms, including multi-drug resistant organisms. The present invention includes compounds according to formula (Ia):
or a pharmaceutically acceptable salt thereof, wherein the values of R1, R2, R3 and R4 are described herein.