| 摘要 |
Compounds of the formula I <IMAGE> in which A, R1, R2, R3, R4, R5 and R6 are as defined in claim 1, are effective optical stabilizers for photographic dyes and their precursors. They are added to the colorphotographic recording materials as the latter are being prepared, and, as a result, the developed images have a longer optical stability.
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