摘要:
An improved process for the preparation of 20-keto-21(S)-hydroxy steroids of the Formula ##STR1## wherein R.sub.1 is alkyl of 1 to 3 carbon atoms, R.sub.2 is alkyl of 1 to 12 carbon atoms, and R.sub.3 is alkyl of 1 to 4 carbon atoms and novel intermediates therefrom.
摘要:
Mixtures of compounds of ##STR1## or a mixture of the latter and a compound of the formula ##STR2## which are useful intermediates for the preparation 20-keto-21(S)-hydroxy steroids.
摘要:
A compound of the formula ##STR1## wherein R is hydrogen or an ester remainder, X is hydrogen or fluorine and Y combined with the doted lines represents ##STR2## or X is hydrogen and and Y combined with the dotted lines is ##STR3## and R.sub.1 is the remainder of an enol ether or ester.
摘要:
Crystallized anhydrous zilpaterol hydrochloride having less than 5% of the crystals with a size of less than 15 microns and at least 95% of the crystals having a size of less than 250 microns and a process for its preparation and novel intermediates.
摘要:
The invention relates to spherical telithromycin clusters and to a method for the production thereof characterized in that a telithromycin crystal suspension is prepared, said crystals are coated with a telithromycin insoluble phase which gradually crystallizes. The spherical telithromycin clusters are used in the preparation of micro-capsules.
摘要:
Crystallized anhydrous zilpaterol hydrochloride having less than 5% of the crystals with a size of less than 15 microns and at least 95% of the crystals having a size of less than 250 microns and a process for its preparation and novel intermediates.
摘要:
Two new crystalline forms of 1S-[1alpha(2S*, 3R*), 9alpha]6, 10-dioxo-N-(2-ethoxy-5-oxo-tetrahydro-3-furany1)-9 [[(1-isoquinolyl) carbony1]amino]octahydro-6H-pyridazino [1,2-a][1,2]diazepin-1-carboxamide (anhydrous or hydrated), their preparation process and the pharmaceutical compositions containing them.