Catechol + OH 1.06  0.13 Syringol + OH 1.18  0.14 Guaiacol + OH 1.12  0.13 + OH SOA instead will yield similar results since the parameterization is based on roomtemperature viscosity measurements and our results for these types of phenolic BB-SOA were similar. Since guaiacol + OH SOA had lower viscosity at RH ~ 25%, we expect the results to tend toward lower viscosity compared with catechol + OH SOA.