(2S)-1'-hydroxy-2',2'-dimethyl-4t-(4-oxo-4H-quinazolin-3-yl)-(2rC8'a,9'r'O,9'at')-3,4,1',9'a-tetrahydro-2'H-spiro[furan-2,9'-imidazo[1,2-a]indole]-5,3'-dione;Tryptoquivaline G (FTG);tryptoquivaline-G;fumitremorgin-G;FTG;(3'S,3aR,4R)-3-hydroxy-2,2-dimethyl-3'-(4-oxoquinazolin-3-yl)spiro[3aH-imidazo[1,2-a]indole-4,5'-oxolane]-1,2'-dione