The present invention provides a metabolite produced by hydrolysis of the ester compound tert-butyl N-[2-{4-[6-amino-5-(2,4-difluorobenzoyl)-2-oxopyridin-1(2H)-yl]-3,5-difluorophenyl}ethyl)-L-alaninate, which is useful for inhibiting the activity of a p38 MAP kinase enzyme.