(3R,4R,5S)-4-acetamido-5-[(tert-butoxycarbonyl)-amino]-3-(1-ethylpropoxy)-1-bromocyclohexene

(3R,4R,5S)-4-acetamido-5-[(tert-butoxycarbonyl)-amino]-3-(1-ethylpropoxy)-1-cyclohexene-1-carboxylic acid