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

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

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

(2S,3S,Z)-tert-butyl 4-ethylidene-2-(hydroxymethyl)-3-methylpyrrolidine-1-carboxylate

(2S,3S,Z)-1-(tert-butoxycarbonyl)-4-ethylidene-3-methylpyrrolidine-2-carboxylic acid