| ethyl n-(tert-butoxycarbonyl)-d-pyroglutamate |
| n-(tert-butoxycarbonyl)-d-pyroglutamic acid ethyl ester |
| ethyl (R)-1-(tert-butoxycarbonyl)-5-oxopyrrolidine-2-carboxylate |
| (R)-1-(tert-butoxycarbonyl)-5-oxopyrrolidine-2-carboxylic acid ethyl ester |
| ethyl n-boc-d-pyroglutamate |
| n-boc-d-pyroglutamic acid ethyl ester |
| ethyl (R)-1-boc-5-oxopyrrolidine-2-carboxylate |
| (R)-1-boc-5-oxopyrrolidine-2-carboxylic acid ethyl ester |
| boc-d-pyr-oet |