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An important feature of our database, which is also unique among other chemical databases, is the possibility to store the conditions of experiments. This information is crucial for modeling: in many cases, the result of an experimental measurement is senseless without knowing the conditions under which the experiment has been conducted. For example, it does not make sense to specify the boiling point for a compound without specifying the air pressure. Such conditions should be introduced as obligatory conditions, i.e., a new record will be rejected by the system if there is no information about these conditions provided. Conditional values stored in the database can be numerical (with units of measurement), qualitative or descriptive (textual). Moreover, in the “conditions” section it is possible to note additional information related to the experiment, even if it is not a “condition” in the classical sense. Examples of such additional information are assay descriptions, a target of the ligand (the receptor) or species on which the biological activity has been tested. For simplicity, we further universally refer to all this information as “conditions”.