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Ethyl 3-(pyridin-2-yl)propiolate

Ethyl 3-(pyridin-3-yl)propiolate

Ethyl 3-bromopropiolate

N-(1-methyl-1h-pyrazol-4-yl)guanidine

N,n-bis-boc-1-guanylpyrazole

1-Nitroso-3-piperidinecarboxylic acid

1-Methylcyclopropyl pyridin-2-yl carbonate

1-Methoxy-2-methylpropan-2-yl pyridin-2-yl carbonate