Tau protein (4 μM) was incubated with ODS (50 μM) without agitation (24 h at 37°C) in the presence of either 3, 6, 7, 8 (composed of benzothiazole, benzoxazole, quinoline, and dimethylindole heterocycles, respectively) or DMSO vehicle alone, then assayed for aggregation by filter trap assay. Each point represents normalized aggregation relative to the DMSO vehicle control (mean of triplicate determination ± SD), whereas each solid line represents best fit of the data points to eq 4. All heterocycles except benzoxazole supported inhibitory activity under these conditions.