Bioprecursors for percutaneous application

Drug – bio-affecting and body treating compositions – Designated organic active ingredient containing – Having -c- – wherein x is chalcogen – bonded directly to...

Reexamination Certificate

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C549S410000

Reexamination Certificate

active

07084172

ABSTRACT:
The invention concerns a bioprecursor of formula (I), wherein A1and A2represent independently of each other a radical derived from a molecule capable of being used in dermatology or in cosmetology; X and Y represent independently of each other a hydrogen atom, a hydroxy group or a C1–C20alkyl group; and n represents an integer between 0 and 10

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