Molecules are assigned unique identifiers ("MPculeIDs") based on their chemical formulas, charges, spin multiplicities, and connectivity; further details regarding the MPculeID format are provided below (see "Unique Identifiers"). Likewise, tasks are given unique IDs defined by an (optional) prefix and some integer. MoleculeDocs store a list of the IDs of all tasks performed on the same geometry. Collected MoleculeDocs additionally store the IDs of the tasks that produced the "best" structure for each implicit solvent medium (including vacuum) for that molecule and the MPculeIDs of the "similar" associated MoleculeDocs (documents with the same connectivity, but with geometries representing different PES minima). This allows users to collect the properties of various conformers of a given molecule.