tert-butyl ((2R,3S,Z)-2-((tert-butoxycarbonyl)amino)-4-(hydroxymethyl)-3-methylhex-4-enoyl)-L-leucinate

(S)-tert-butyl 2-[(2R,3S,Z)-2-(tert-butoxycarbonylamino)-4-(hydroxymethyl)-3-methylhex-4-enamido]-4-methylpentanoate

methyl (Z)-N6-(N,N'-bis(tert-butoxycarbonyl)carbamimidoyl)-L-lysinate

(R)-tert-butyl but-2-ynyl(1-hydroxybut-3-en-2-yl)carbamate

(7S,7aR,Z)-6-ethylidene-7-methyltetrahydropyrrolo[1,2-c]oxazol-3(1H)-one