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US 4,071,631 AGranted
Antibiotic A21A
AssigneeMerck & Co., Inc.
InventorsSheldon B. Zimmerman, John H. Chalmers, Jr.
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Abstract
There is disclosed a new antibiotic A21A which is produced by cultivating the microorganism, Streptomyces filipinensis, in aqueous nutrient medium. The antibiotic has growth-improving activity.
Claims3
A compound having the following structure:
- ##STR2## or its pharmaceutically acceptable salts or esters.
The compound A21A having the following structure:
- ##STR3##
Dependencies are inferred from the claim text.