Tricyclic quinoxaline and quinoline derivatives as a UV filter

Drug – bio-affecting and body treating compositions – Topical sun or radiation screening – or tanning preparations

Reexamination Certificate

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C424S070900

Reexamination Certificate

active

07101537

ABSTRACT:
The invention relates to the use of quinoxaline derivatives of formula I, represented by formulas 1aand 1b, as photostable UV filters, in particular in cosmetic and pharmaceutical preparations for protecting the human epidermis or human hair against UV radiation, above all in the 280–400 nm range.

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Schipper and Day, Imidazoles. I. Imidazo[b]quinoxalines' Journal of the American Chemical Society, vol. 73(12), pp. 5672-5675 (1951).
Sircar and Pal, “Studies in Heterocylic Compounds. Part II.” Journal of the Indian Chemical Society, vol. IX, pp. 527-532 (1932).

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