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.