Data from S-S-imidazolidinone collected as part of the EPOC project. Datasets are stored in HDF5 format. Each file starts with a 3-digit identifier. For every diffraction data set, the subdirectory XDS contains a subdirectory starting with the same ID, containing XDS.INP with experimental description. Datasets without corresponding XDS.INP are crystal images, usually of the preceding data collection.