Synonyms: Spiro[furan-2(5H),9'-[9H]imidazo[1,2-a]indole]-3',5(2'H)-dione,1',3,4,9'a-tetrahydro-1'-hydroxy-2'-methyl-4-[2-(2-methyl-1-oxopropyl)-4-oxo-3(4H)-quinazolinyl]-,[2'S-[2'a,9'b(S*),9'aa]]-; Nortryptoquivalone; Tryptoquivaline B; Tryptoquivalone