[Rugulosuvines A and B--diketopiperazine alkaloids from Penicillium rugulosum and Penicillium piscarium fungi].

Two diketopiperazine alkaloids, rugulosuvines A and B (tryptophan and phenylalanine are their precursors), were isolated and purified from a culture liquid of Penicillium rugulosumVKM F-352 and Penicillium piscariumVKM F-325 fungi. Physical and physicochemical studies showed the absolute structure of rugulosuvine A. The absolute structure of rugulosuvine B was demonstrated to be identical to that of rugulosuvine A.