You can introduce a functional group at the N-1 position of the pyrazole ring by reacting it with appropriate reagents. This can involve the use of alkyl or aryl halides, isocyanates, or other electrophiles depending on the desired functional group.
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DIMETHYL 4-IODO-1H-PYRAZOLE-3,5-DICARBOXYLATE
C21H15N5O3S
R,S-1-O-Benzyl-2-(benzyloxycarbonylamino)-1,3-propandiol
