Lu 26-046 is the agonist for muscarinic M1 receptor and M2 receptor and a weak antagonist for M3 receptor, with Ki of 0.51, 26 and 5 nM, respectively. Lu 26-046 exhibits specific stimulus property, that can be recognized by rats[1].
[1] Arnt J, et al., Discriminative stimulus properties of the muscarinic receptor agonists Lu 26-046 and O-Me-THPO in rats: evidence for involvement of different muscarinic receptor subtypes. Eur J Pharmacol. 1992 Jul 21;218(1):159-69. DOI:10.1016/0014-2999(92)90160-6
