Our sample collection grows dynamically, and almost every day the sample count is expanding. The highest possible quality of the individual samples in the library is essential for providing reliable and reproducible screening results. Compound integrity in time is assured by optimal storage conditions (-20 °C, nitrogen atmosphere) and gentle handling conditions (limiting freeze-thaw cycles, limited exposure to atmospheric environment, protection of light-sensitive samples from daylight, etc.). Identity of the chemical samples is assured by following strict rules for registration and handling, which contain a series of security checkpoints to prevent unwanted sample confusion.