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Propylthiouracil

2,3-Pyrazinecarboxylic anhydride

2,3-Pyrazinedicarboxylic acid

Pyrazinoic acid hydrazide

Pyrazole-4-boronic acid pinacol ester

5-Pyrazolecarboxylic acid

1,9-Pyrazoloanthrone

Pyrazolo[1,5-a]pyridine-2-carboxylic acid