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1,3,3 - trimethyl (indoline - 2.3 - (h) - gas (2.1 - b) - (1,4) oxazine) connection with fotochrome properties, and optical element of this compound is applied.
1,3,3 - trimethyl (indoline - 2.3 - (h) - gas (2.1 - b) - (1,4) oxazine) connection with fotochrome properties, and optical element of this compound is applied.