(R)-2-methylbut-3-enoic acid

methyl N-[(10R,11E,14S)-14-{[(tert-butoxy)carbonyl]amino}-10-methyl-9-oxo-8,16-diazatricyclo[13.3.1.02'7]nonadeca-1(19),2(7),3,5,11,15,17-heptaen-5-yl]carbamate

methyl N-[(10R,14S)-14-{[(tert-butoxy)carbonyl]amino}-10-methyl-9-oxo-8,16-diazatricyclo[13.3.1.02'7]nonadeca-1(19),2(7),3,5,15,17-hexaen-5-yl]carbamate

methyl N-(4-{2-[(1S)-1-{[(tert-butoxy)carbonyl]amino}but-3-en-1-yl]pyridin-4-yl}-3-((2R)-2-methylbut-3-enamido)phenyl)carbamate

ethyl [(3-chloro-2,6-difluorophenyl)(prop-2-en-1-yl)carbamoyl]formate