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2Interaction of 4,5-diphenyl-2,3-dihydro-2,3-pyrroledione with ethoxycarbonylmethylenetriphenylphosphorane: synthesis and crystal structure of 4,5-diphenyl-Z-2-ethoxycarbonylmethylene-2,3-dihydro-3-pyr
rolone, Russian Chemical Bulletin Three-component spiro-heterocyclization of 4,5-diphenyl-1H-pyrrole-2,3-dione under the action of malononitrile and 3-hydroxycyclohex-2-en-1-ones, Russian Journal of Organic Chemistry