Piperidinium, 1-[(3,4-dimethoxyphenyl)methyl]-4-[[[(2S)-2-[[[[4-(ethoxycarbonyl)phenyl] amino]carbonyl]amino]-3-(4-hydroxyphenyl)-1-oxopropyl]amino]methyl]- 1-methyl-, 2,2,2-trifluoroacetate (1:1)