5-[[(4S)-4-Hydroxy-4-methyl-2-isoxazolidinyl]carbonyl]-3-methyl-1-(1-methylethyl)-6-[[3-methyl-5-(trifluoromethyl)-1H-pyrazol-4-yl]methyl]thieno[2,3-d]pyrimidine-2,4(1H,3H)-dione