(S)-tert-butyl (1-(5-(2-amino-4-nitrophenyl)-2-fluoropyridin-3-yl)but-3-en-1-yl)carbamate

methyl (3-amino-4-(5-((1S)-1-((tert-butoxycarbonyl)amino)but-3-en-1-yl)-6-fluoropyridin-3-yl)phenyl)carbamate

tert-butyl (S)-(1-(5-(2,4-diaminophenyl)-2-fluoropyridin-3-yl)but-3-en-1-yl)carbamate

methyl (4-(5-((1S)-1-((tert-butoxycarbonyl)amino)but-3-en-1-yl)-6-fluoropyridin-3-yl)-3-((2-methylbut-3-enoyl)amino)phenyl)carbamate