Salts of pyrimidine derivatives are provided having the formula: . The devices comprise an outer bag formed of an impermeable material and an inner bag formed of a permeable material, the inner bag containing an absorbent material or being adapted for connection to a source of reduced pressure. 40 \u212b, a bulk silica to alumina ratio above about 12, and a surface area of at least about 850 m2g as measured by the BET method and ATSM D4365-95 with nitrogen adsorption at a ppo value of 0. The apparatus further includes a shock absorber disposed on the tube and a cap disposed on the shock absorber. A figure of merit is calculated from one or more of the series of reduced data values for a library member at the corresponding library location.