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G. USHA, S. SELVANAYAGAM, D. VELMURUGAN, K. RAVIKUMAR, R. RATHNA DURGA, R. RAGHUNATHAN. "Crystal Structure of Acenaphthene-1′-one-spiro[2′.3]-[4-ethoxycarbonyl]-1N-methyl-pyrrolidine-spiro[2.2″]oxindole." Analytical Sciences X-ray Structure Analysis Online (2006) x21-x22