| 摘要 |
Compounds of the formula I <IMAGE> (I) in which X is a group <IMAGE> and R1, R2, R3, R4 and R5 are monovalent organic radicals, at least one of which contains a sterically hindered phenol group and at least one of which contains a polyalkylpiperidine group, are outstanding light stabilizers for color-photographic recording materials. They also have a stabilizing action on the photo dyes and their precursors when stored in the dark.
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