IUPAC:(1S,1'S,3'S,4'S)-3',4'-dipropyl-6,6'',7,7''-tetrahydro-3H,3''H-dispiro[2-benzofuran-1,2'-cyclobutane-1',1''-[2]benzofuran]-3,3''-dione
IUPAC:(1S,1'S,3'S,4'S)-3',4'-dipropyl-6,6'',7,7''-tetrahydro-3H,3''H-dispiro[2-benzofuran-1,2'-cyclobutane-1',1''-[2]benzofuran]-3,3''-dione