Patent ID: 7935825

Claim:
A compound of the formula I wherein A is selected from the group consisting of optionally substituted: pyridyl, pyrazinyl, pyridazinyl, pyramidal, thienyl, thiazolyl, oxazolyl and thiadiazolyl; B is selected from the group consisting of optionally substituted: pyridyl and pyridone; X is selected from the group consisting of optionally substituted: pyridyl, pyrazinyl, pyrimidinyl, pyridazinyl, pyrrolyl, thienyl, furyl, imidazolyl, pyrazolyl, thiazolyl, isothiazolyl, oxazolyl, isoxazolyl, and phenyl; R 1 is selected from the group consisting of is CO 2 H, CO 2 R COSO 2 NR 2 , tetrazolyl, P(O)(OR) 2 and SONH 2 , wherein R is Me; R 2 is selected from the group consisting of H, C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl and C 1-3 alkylaryl; R 3 is selected from the group consisting of H and C 1-5 alkyl and R 4 is selected from the group consisting of H and C 1-5 alkyl.