Recovery of doxycycline and products

Polyphosphate complexes of 6-demethyl-6-deoxy-6-methylenetetracycline and its 11a-halo derivatives

Alkali methal polymetaphate complexes of doxycycline

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

Antibiotic derivatives

Preparation of steroids

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