Safracins,new antitumor antibiotics II. Physicochemical properties and chemical structures.

Safracins,new antitumor antibiotics II. Physicochemical properties and chemical structures. Safracins,new antitumor antibiotics I. Producing organism,fermentation and isolation. New antibiotics, saframycins A, B, C, D and E. Structural studies on minor components of saframycin group antibiotics saframycins F, G and H. Azinomycins A and B, new antitumor antibiotics. II Chemical structures. The structures of fosfazinomycins A and B A new antitumor antibiotic, FR900840. II. Structural elucidation of FR900840. New streptothricin-group antibiotics, AN-201 I, II and III. II. Chemical structures. Isolation and structural elucidation of new saframycins Y3, Yd-1, Yd-2, Ad-1, Y2b and Y2b-d. Fredericamycin A a new antitumor antibiotic. I. Production, isolation and physicochemical properties.