(1S,5R,8S)-6-acetyl-8-iodo-2-oxa-6-azabicyclo[3.3.0]octan-3-one

ethyl (4S,5R)-[4-hydroxy-1-(4-methoxybenzyl)-2-oxopyrrolidin-5-yl]acetate

(1R,5R)-6-(4-methoxybenzyl)-2-oxa-6-azabicyclo[3.3.0]octan-3,7-dione

(4S,5R)-2-[4-hydroxy-1-(4-methoxybenzyl)-2-oxopyrrolidin-5-yl]acetic acid

[(S)-3-Benzyloxy-2-hydroxy-1-(4-methoxy-benzyl)-5-oxo-pyrrolidin-2-yl]-acetic acid ethyl ester