(3R,4R)-4-tert-Butoxycarbonylamino-3-hydroxy-cyclohexa-1,5-dienecarboxylic acid methyl ester

methyl (3R,4R)-4-((tert-butoxycarbonyl)amino)-3-((3-methoxy-3-oxoprop-1-en-2-yl)oxy)cyclohexa-1,5-diene-1-carboxylate

dimethyl 2-(((1S,6S)-6-((tert-butoxycarbonyl)amino)-3-(methoxycarbonyl)cyclohexa-2,4-dien-1-yl)oxy)malonate

2-((1R,6R)-6-tert-Butoxycarbonylamino-3-methoxycarbonyl-cyclohexa-2,4-dienyloxy)-2-dimethylaminomethyl-malonic acid dimethyl ester

[2-((1R,6R)-6-tert-Butoxycarbonylamino-3-methoxycarbonyl-cyclohexa-2,4-dienyloxy)-2,2-bis-methoxycarbonyl-ethyl]-trimethyl-ammonium; iodide