[Isolation and study of the antibiotics produced by a culture of Str. iverini (Gause et al., 1957) Pridham et al., 1958].

An antibiotic complex consisting of echinomycin and triostin A was isolated from Str. iverini (Gauze et al., 1957) Pridham et al., 1958. Hydrolysis of the antibiotics resulted in formation of an aglycone identified with quinoxaline carboxylic acid. The UV spectrum of the aglycone and the antibiotics of the echinomycin-triostin group was studied.