Daiichi Pharmaceutical Co., Ltd.

Rikagaku Kenkyusho

Snow Brand Milk Products Co., Ltd.

Kaken Kagaku Kabushiki Kiasha

Kiyoshi Isono

Hidetoshi Takahashi

Makoto Yoshihama

Yoshikazu Ikeda

Shinobu Kagami

Ken-ichi Kimura

Kousaku Takahashi

Hiroyuki Osada

Gosei Kawanishi

Makoto Ubutaka

Makoto Ubukata

Shigeo Fujita

Goto Nakamura

Antibiotics RK-1061s having a novel chemical structure and a method of production thereof. They have a structural formula represented by general formula(I) wherein A represents Ror RCH(OR)CH. Rrepresents 3-methylglutaric acid residue and Rrepresents a sulfate group or a hydrogen atom. The process comprises culturing a ray fungus belonging to the genusand isolating RK-1061s from the culture.sp. SN-1061Ms (FERM BP-5800) is capable of stably producing RK-1061 at a high productivity.

Antibiotics RK-1061 and process for preparing the same

Antibiotics RK-1061s having a novel chemical structure and a method of production thereof. They have a structural formula represented by general formula(I) wherein A represents R or R CH(OR )CH . R represents 3-methylglutaric acid residue and R represents a sulfate group or a hydrogen atom. The process comprises culturing a ray fungus belonging to the genus Streptomyces and isolating RK-1061s from the culture. Streptomyces sp. SN-1061Ms (FERM BP-5800) is capable of stably producing RK-1061 at a high productivity.

Reveromycin A, method for preparing the same, and antitumor agent and

This invention relates to a novel antibiotic 76-11; process for the production thereof which comprises culturing an antibiotic 76-11 producing microorganism belonging to the genus Actinomadura to separate and collect the antibiotic; an anticoccidiosis agent comprising the antibiotic as an effective ingredient; and a growth accelerating and feed efficiency increasing agent for domestic animals and fowls comprising the antibiotic as an effective ingredient.

Novel antibiotic 76-11, process for the production thereof,

Growing community of inventors

Oomiya, Japan

Kiyoshi Isono