| 摘要 |
Described herein are photochromic compounds or a structural isomer of the photochromic compound, the photochromic compounds represented by the formula: <IMAGE> wherein R1, R2, R4, R5, R6, R8, A, B, C, and D are each selected from the group consisting essentially of hydrogen, a stable organic radical, a heterocyclic group, halogen, a nitrogen-substituted radical, and a nitrogen-substituted ring radical.
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