Preparation of pharmacologically active 16-methyl-9.alpha.-halo steroid esters and ethers

16.beta.-Methyl-17-hydroxypregna-1,4,9(11)-triene-3,20-dione

16-Methyl-9.alpha.-halogen steroid esters and ethers

Sulfate and phosphate 21-esters of corticosteroids

Esters and ethers of 16-methyl-9.alpha.-halocorticosteroids

Alkali metal polymetaphosphate complexes of doxycycline

Separation of .alpha.-6-deoxytetracyclines from reaction mixtures

Doxycycline alkali metal polyphosphate complex with improved pharmacological properties

Doxycycline alkali metaphosphate complexes

Tetracycline derivatives

alpha.-6-Deoxytetracyclines from anhydrotetracyclines

Corticosteroid 21-sulfate and phosphate esters