(2R,3R,4S)-2-[[[(1R)-2-[(3-fluorophenyl)methoxy]-1-phenylethyl]amino]methyl]pyrrolidine-3,4-diol (2R,3R,4S)-2-[[[(1R)-2-[(3-fluorophenyl)methoxy]-1-phenyl-ethyl]amino]methyl]pyrrolidine-3,4-diol (2R,3R,4S)-2-[[[(1R)-2-(3-fluorobenzyl)oxy-1-phenyl-ethyl]amino]methyl]pyrrolidine-3,4-diol