. "2-((2S,4S)-4-Amino-2-methyl-pyrrolidin-1-yl)-9-(2,4-difluoro-phenyl)-3-fluoro-6-oxo-6H-pyrido[1,2-a]pyrimidine-7-carboxylic acid" . "(S,S)12f" . . . . . . . . . . . . . . . .