5-[(3R,4R)-3-((S)-1-Benzyloxy-ethyl)-4-carbamoyl-pent-1-ynyl]-3-(2-methoxycarbonyl-ethyl)-4-methyl-1H-pyrrole-2-carboxylic acid tert-butyl ester
5-[(3R,4S)-3-((R)-1-Benzyloxy-ethyl)-4-carbamoyl-pent-1-ynyl]-3-(2-methoxycarbonyl-ethyl)-4-methyl-1H-pyrrole-2-carboxylic acid tert-butyl ester
5-[(3R,4R)-3-((S)-1-Hydroxy-ethyl)-4-(4-methoxy-benzylcarbamoyl)-pent-1-ynyl]-3-(2-methoxycarbonyl-ethyl)-4-methyl-1H-pyrrole-2-carboxylic acid tert-butyl ester
5-[(3S,4S)-3-((R)-1-Benzyloxy-ethyl)-4-carbamoyl-pent-1-ynyl]-3-(2-methoxycarbonyl-ethyl)-4-methyl-1H-pyrrole-2-carboxylic acid tert-butyl ester
tert-Butyl α-(Triphenylphosphoranylidene)-α-(5-(tert-butoxycarbonyl)-4-(2'-(methoxycarbonyl)ethyl)-3-methylpyrrol-2-yl)acetate