Abstract: The present invention relates to novel antibiotics TKR1912-I having the following formula I and TKR1912-II having the following formula II or pharmacologically acceptable salts thereof, which are useful as a remedy for fungal infections, as well as a process for producing them and a microorganism capable of producing them.

Abstract: Novel antibiotics useful as a remedy for fungal infections and a process for producing antibiotic TKR1912-I or pharmacologically acceptable salts thereof, which substances have such plysicochemical properties that (1) the mass spectrum thereof according to FAB-MS has a peak of m/z of 559 [M+H].sup.+ ; (2) the molecule bears 26 carbon atoms and no nitrogen atom; (3) the ultraviolet absorption spectrum thereof in methianol shows a terminal absorptions; (4) the main absorption wavenumbers of the infrared absorption spectrum according to the KBr method are 3430, 2920, 2850, 1740, and 1190 cm.sup.-1 ; and (5) they are soluble in methanol, chloroform, and water, but are sparingly soluble in hexane.