(1S)-tert-butyl-1-{[(2,4-dimethoxybenzyl)amino]methyl}but-3-enylcarbamate

(S)-4-tert-butoxycarbonyl-1-(2,4-dimethoxybenzyl)-5-[2-(phenylsulfonyloxy)ethyl]-2-piperazinone

(1S)-tert-butyl-1-{[(chloroacetyl)(2,4-dimethoxybenzyl)amino]-methyl}but-3-enylcarbamate