The MUV data sets were described at:
S. G. Rohrer, K. Baumann, Maximum Unbiased Validation (MUV) data sets for virtual screening based on PubChem bioactivity data.
J. Chem. Inf. Model. 49 (2009) 169-184.
DOI: 10.1021/ci8002649
In case you want to download the MUV data sets please contact us at muv(at)tu-bs.de
or see:
S. Riniker, G. A. Landrum, Open-source platform to bechmark fingerprints for ligand-based virtual screening,
J. Cheminform. 5:26 (2013)
DOI: 10.1186/1758-2946-5-26 (additional file 5 also contains the MUV data sets).