A crystalline polymorph form of (Sa)-(-)-3-{3-Bromo-4-[(2,4-difluorobenzyl)oxy]-6-methyl- 2-oxopyridin-1(2H)-yl}-N,4-dimethylbenzamide, Form H.L'invention concerne une forme polymorphe cristalline de (Sa )-(-)-3-{3-Bromo-4-[(2,4-difluorobenzyl)oxy]-6-methyl- 2-oxopyridin-1(2H)-yl}-N,4-dimethylbenzamide, forme H.