2-Propenoic acid, 3-[2-[4-[(cyclopropylamino)methyl]phenyl]-8-[[[4-(1,1-dimethylethyl)-2-thi azolyl]amino]carbonyl]-4-oxo-4H-pyrido[1,2-a]pyrimidin-3-yl]-, 1,1-dimethylethyl ester, (2E)-