(4S,5R)-5-((1R,2S)-1-amino-2-methoxy-2-methylpentyl)-1-(4-methoxybenzyl)-4-((Z)-prop-1-en-1-yl)pyrrolidin-2-one

(4S,5R)-5-((1R,2S)-1-amino-2-methoxy-2-methylpentyl)-1-(2,4-dimethoxybenzyl)-4-((Z)-prop-1-en-1-yl)pyrrolidin-2-one

N-{(2S)-methoxy-(1R)-[1-(4-methoxybenzyl)-5-oxo-(3S)-Z-propenylpyrrolidin-(2R)-yl]-(2S)-methylpentyl}-acetamide

{(2S)-methoxy-(1R)-[1'-(2,4-dimethoxybenzyl)-5'-oxo-2',5'-dihydro-1H-pyrrol-(2'R)-yl]-(2S)-methylpentyl}-carbamic acid tert-butyl ester

{(2S)-methoxy-(1R)-[1-(4-methoxybenzyl)-5-oxo-(3S)-Z-propenylpyrrolidin-(2R)-yl]-(2S)-methylpentyl}-carbamic acid tert-butyl ester