英文别名(2E)-1,2,6,7-tetrahydro-8H-indeno[5,4-b]furan-8-ylideneethanenitrile; (1,2,6,7-Tetrahydro-3-oxa-as-indacen-8-ylidene)-acetonitrile; 2-(1,2,6,7-tetrahydro-8H-indeno[5,4-b]furan-8-ylidene)acetonitrile; (E)-2-(6,7-Dihydro-1H-indeno[5,4-b]furan-8(2H)-ylidene)acetonitrile; (2E)-1,2,6,7-Tetrahydro-8H-indeno[5,4-b]furan-8-ylideneacetonitrile; Ramelteon Impurity 6 
