Group of antitumor compounds and method for producing the same

摘要

PCT No. PCT/JP97/00827 Sec. 371 Date Jun. 10, 1997 Sec. 102(e) Date Jun. 10, 1997 PCT Filed Mar. 14, 1997 PCT Pub. No. WO97/44479 PCT Pub. Date Nov. 27, 1997A mold belonging to the genus Ascochyta is cultivated with a medium to obtain a culture. A compound having a structure represented by the following formula and having an antitumor activity, which is capable of forming a tautomeric equilibrium mixture composed of tautomers, is collected from the culture, or a mixture of the tautomers is collected from the culture.