We obtained experimental activity coefficients at infinite dilution from ThermoML, an XML-based system for storage and exchange of thermochemical data. ThermoML was accessed on July 27, 2017 using thermopyl, a Python tool that allows interaction with the database and provides access via a Pandas Dataframe. We made a search for IDACs of or-ganic compounds containing less than 40 heavy atoms at temperatures between 250 K and 400 K. All the activity coefficients were obtained approximately at 101 kP a. The search was restricted to molecules containing no elements other than C, O, N, F, P, S, and Cl.