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Reference.org
Pyrazole
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<p>Pyrazole is an <a href="/facts/Organic_compound/gqCNaN45">organic compound</a> with the <a href="/facts/Chemical_formula/hghUtthl">formula</a> (CH)3N2H. It is a <a href="/facts/Heterocycle/8oYSjJxY">heterocycle</a> characterized as an <a href="/facts/Azole/Nj3CWSM2">azole</a> with a 5-membered ring of three <a href="/facts/Carbon/ukrgQexo">carbon</a> atoms and two adjacent nitrogen atoms, which are in <a href="/facts/Arene_substitution_pattern/ByM7Y1b9">ortho-substitution</a>. Pyrazoles are also a class of compounds that have the ring C3N2 with adjacent nitrogen atoms. Pyrazole itself has few applications but many substituted pyrazoles are of commercial interest. Notable drugs containing a pyrazole ring are <a href="/facts/Celecoxib/DqbVQYSs">celecoxib</a> (celebrex) and the anabolic steroid <a href="/facts/Stanozolol/eMxLBlE5">stanozolol</a>. </p>