1,8-Naphthyridine-3-carboxamide, 1,2-dihydro-1-butyl-4-hydroxy-N-(8-methyl-8-azabicyclo(3.2.1)oct-3-yl)-2-oxo-, endo-, (E)-2-butenedioate (1:1) (salt) 139094-71-6