2-benzyloxymethyl-1-(4-methoxy-benzyl)-3-methyl-5-oxo-2,5-dihydro-1H-pyrrole-2-carboxylic acid methyl ester

methyl (2R,3S)-1-(4-methoxybenzyl)-2-((benzyloxy)methyl)-3-hydroxy-3-methyl-4-methylene-5-oxopyrrolidine-2-carboxaldehyde

2-benzyloxymethyl-3-hydroxy-1-(4-methoxy-benzyl)-3-methyl-4-methylaminomethyl-5-oxo-pyrrolidine-2-carboxylic acid methyl ester