PCT No. PCT/DK90/00077 Sec. 371 Date Sep. 20, 1991 Sec. 102(e) Date Sep. 20, 1991 PCT Filed Mar. 19, 1990 PCT Pub. No. WO90/11283 PCT Pub. Date Oct. 4, 1990.A process for the preparation of 9-substituted quanine derivatives of general formula (I), in which R is C1-C4-alkyl optionally substituted with one or more hydroxy groups, or R is ( alpha ), benzyl, ribosyl, 2'-deoxyribosyl or (CH2)n-OR1 wher...

The present invention provides temperature stable crystalline etoposide 4'-phosphate diethanol solvate, and a process for its preparation.

Improved processes for the synthesis of tigogenin beta-cellobioside, a known hypocholesterolemic agent, using cellobiose heptaacetate and tigogenin as starting materials, and novel intermediates useful in this process.

A cascade-sweep process for the production of a high purity gas using too or more membranes in combination, which entails: a) collecting a non-permeate stream of a stage N and using the same as a feed stream for a stage N+1, b) collecting a permeate stream of said stage N+1 and feeding the same to a permeate stream of a stage N by counter-current sweep, and c) collecting a permeate of a first st...

A hollow fiber separation module (10) is provided having a single, elongated pressurizable shell (11) and containing multiple separation stages by multiple sections of hollow fiber bundles (18,20) contained within the shell, with the ends of each bundle section potted within a single tubesheet (27,28) at each end of the elongated shell. The fibers within each section are aligned so that the permea...