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- [17] Synthesis and structural investigation of 1′,3′,3′-trimethyl-6-hydroxy-spiro(2H-1-benzopyran-2,2′-indoline), 1′,3′,3′-trimethyl-6-methacryloyloxy-spiro(2H-1-benzopyran-2,2′-indoline) and a copolymer with methyl methacrylate by 1D and 2D NMR spectroscopy European Polymer Journal, 2006, 42 (06): : 1455 - 1466