1-METHYLETHYL (.ALPHA.R,.GAMMA.R)-.GAMMA.-ACETYL-.ALPHA.-(((1,1-DIMETHYLETHOXY)CARBONYL)AMINO)-2,3,6-TRIFLUOROBENZENEBUTANOATE, REL-
1-methylethyl (.alpha.r,.gamma.r)-.gamma.-acetyl-.alpha.-(((1,1-dimethylethoxy)carbonyl)amino)-2,3,6-trifluorobenzenebutanoate, rel-