1-[(2S)-2-Amino-4-[2,4-bis(trifluoromethyl)-5,8-dihydropyrido[3,4-d]pyrimidin-7(6H)-yl]-4-oxobutyl]-5,5-difluoropiperidin-2-one tartrate Salt; 2-Piperidinone, 1-[(2S)-2-amino-4-[5,8-dihydro-2,4-bis(trifluoromethyl)pyrido[3,4-d]pyrimidin-7(6H)-yl]-4-oxobutyl]-5,5-difluoro-, (2R,3R)-2,3-dihydroxybutanedioate
