Rugulosuvines are bio-active alkaloids made by Penicillium, that belongs to a class of naturally occurring 2,5-diketopiperazines. Kozlovskiĭ AG, Adanin...
Kozlovskiĭ, A. G.; Adanin, V. M.; Dahse, H. M.; Grafe, U (2001). "Rugulosuvines a and B--diketopiperazine alkaloids from Penicillium rugulosum and Penicillium...