To perform charge density studies for a series of uridine 5¿-monophosphate potassium salts which differ one from another due to the different amount of potassium atoms and water molecules per one uridine fragment in their crystal structures we need high quality neutron data (ADPs and H-atom positions) for at least one compound from the series. We would like to apply for ca. 2-3 days of data collection on the SXD beamline in order to perform two-temperature studies (at 10 K, 100 K) on one of our single crystals. We would like to correlate and compare the charge density and electrostatic properties based on experimental data of such system with those obtained by the use of a new version of the UBDB databank of pseudoatoms. The UBDB databank was recently improved and extended of a great number of new atom types paying special attention to those present in the nucleic acids. Our experimental