Thermo‐ and photochromic dyes: Spiro(indolinebenzopyrans). 2—detailed assignment of the 1H NMR spectra and structural aspects of the closed form of 1,3,3‐trimethylspiro(indoline‐2,2′‐benzopyrans)

Sam‐Rok ‐R Keum, Ki‐Bong ‐B Lee, Peter M. Kazmaier, Richard A. Manderville, Erwin Buncel

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