1,1-Dimethylethyl (2S)-2-(cyanomethyl)-4-[5,6,7,8-tetrahydro-2-[[(2S)-1-methyl-2-pyrrolidinyl]methoxy]-7-(phenylmethyl)pyrido[3,4-d]pyrimidin-4-yl]-1-piperazinecarboxylate [ 2664105-67-1 ]