(3'S,4''S)-N(3)-[3'-(2'',2''-dimethyl-1'',3''-dioxolan-4''-yl)-3'-(N',N'-dibenzylamino)propanoyl]-5,5-dimethyloxazolidin-2-one

(3'S,4''S,αR)-N(3)-[3'-(2'',2''-dimethyl-1'',3''-dioxolan-4''-yl)-3'-(N'-benzyl-N'-(α-methylbenzyl)amino)propanoyl]-5,5-dimethyloxazolidin-2-one

(3'R,4''S,αS)-N(3)-[3'-(2'',2''-dimethyl-1'',3''-dioxolan-4''-yl)-3'-(N'-benzyl-N'-(α-methylbenzyl)amino)propanoyl]-5,5-dimethyloxazolidin-2-one

1-(2-(N-benzyl-2-(thiophen-2-yl)acetamido)-3-methylbutanamido)-2-methylpropan-2-yl methyl carbonate

1-(2-(N-benzyl-2-(thiophen-2-yl)acetamido)-2-(4-methoxyphenyl)acetamido)-2-methylpropan-2-yl methyl carbonate