polymorphic forms, amorphous and hydrated 5-chloro-3- (4-methanesulfonyl-phenyl) -6'-methyl- (2,3 ') bipyridinyl.

A polymorph of the compound of formula ** ** characterized by having a peak positions in the diffraction pattern of powder X-ray, Cu K alpha, at about 8.7 and 15.2 degrees 2-theta.