quinuclidinyl benzilate

Also found in: Acronyms.

qui·nuc·li·din·yl ben·zi·late (QNB),

(kwi-nūk'li-din'il ben'zi-lāt),
A highly potent anticholinergic agent exhibiting 50- to 100-fold greater potency over atropine in binding with and blocking muscarinic cholinergic receptors. Originally developed as a potential military incapacitating agent, it is currently extensively used as a radioactive agent (usually tritiated -H3 -QNB) to identify and label muscarinic receptors in pharmacologic studies.
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