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- [21] Five-membred 2,3-dioxoheterocycles: LXXXI. Reactions of 4,5-bis(methoxycarbonyl)-1H-pyrrole-2,3-diones with N-substituted 3-amino-5,5-dimethyl-2-cyclohex-2-en-1-ones. crystal and molecular structure of methyl 4′-hydroxy-6,6-dimethyl-1,1′-bis(4-methylphenyl)-2,4,5′-trioxo-1,1′,2,4,5,5′,6,7-octahydrospiro[indole-3,2′-pyrrole]-3′-carboxylate RUSSIAN JOURNAL OF ORGANIC CHEMISTRY, 2011, 47 (11) : 1718 - 1722