Spirocyclic replacements for the isatin in the highly selective, muscarinic M1 PAM ML137: the continued optimization of an MLPCN probe molecule

Michael S Poslusney, Bruce J Melancon, Patrick R Gentry, Douglas J Sheffler, Thomas M Bridges, Thomas J Utley, J Scott Daniels, Colleen M Niswender, P Jeffrey Conn, Craig W Lindsley, Michael R Wood