Pyridine, 1,2,3,6-tetrahydro-5-(4-methoxy-1,2,5-thiadiazol-3-yl)-1-methyl; 1,2,3,6-Tetrahydro-5-(4-methoxy-1,2,5-thiadiazol-3-yl)-1-methylpyridine; Xanomeline Methoxy Impurity;