abstract the invention provides compounds of formula i: or a salt thereof as described herein. the invention also provides dermatological compositions comprising a compound of formula or mixtures of one or more compounds of formula i, processes for preparing compounds of formula i, intermediates useful for preparing compounds of formula i and therapeutic methods for protecting skin or dna from photodamage or repairing photodamaged skin or dna. patent abstract: "agents which prevent or repair skin damage". The invention provides compounds of formula I or a salt thereof as described herein. The invention also provides dermatological compositions comprising a compound of formula I or mixtures of one or more compounds of formula I, processes for preparing compounds of formula I, intermediates useful for preparing compounds of formula I and therapeutic methods for skin or DNA protection against photodane or photodanified skin or DNA repair.abstract the invention provides compounds of formula i: or a salt thereof as described herein. the invention also provides dermatological compositions comprising a compound of formula i or mixtures of one or more compounds of formula i, processes for preparing compounds of formula i, intermediates useful for preparing compounds of formula i and therapeutic methods for protecting skin or dna from photodamage or repairing photodamaged skin or dna. tradução do resumo resumo patente de invenção: "agentes que previnem ou reparam dano à pele". a invenção proporciona compostos de formula i: ou um sal do mesmo, conforme descrito aqui. a invenção também proporciona composições dermatológicas compreendendo um composto de fórmula i ou misturas de um ou mais compostos de formula i, processos para preparo de compostos de formula i, intermediários úteis para preparo de compostos de formula i e métodos terapêuticos para proteção da pele ou dna contra fotodano ou reparo de pele ou dna fotodanificado.
