5-Cyano-1-indanone (CAS NO.25724-79-2) is also named as 1H-indene-5-carbonitrile, 2,3-dihydro-1-oxo- ; 1-Oxoindan-5-carbonitril ; 1-Oxoindane-5-carbonitrile ; 2,3-Dihydro-1-oxo-1H-indene-5-carbonitrile .