(S)-2-(3,5-Difluorophenyl)-1-((3S,7S,13S,16S,19S)-13,16,17-trimethyl-2,6,12,15,18-pentaoxo-5-oxa-1,11,14,17-tetraaza-tricyclo[17.3.0.07,11]docos-3-ylcarbamoyl)-ethylammonium 2,2,2-trifluoroacetate