3-Quinuclidinyl thiochromane-4-carboxylate is a research compound which is the most potent muscarinic antagonist known. Tests in vitro showed it to have a binding affinity over 2100 times more potent than 3-quinuclidinyl benzilate (BZ) with an apparent association constant (KA) of 2.47 picomolar (pM).

See also CS-27349 EA-3167 Metixene

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