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from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A five-membered unsaturated heterocyclic ketone (or lactam), derived from pyrazole, that is the basis of several pharmaceuticals

from The Century Dictionary and Cyclopedia

  • n. A crystalline base, , made by the action of hydrazine sulphate on sodium-formyl-acetic ester. It melts at 165° C. Its most important derivative is antipyrin, which is 1-phenyl-2,3-dimethyl-pyrazolone.


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