from UV radiation to protect the hair and skin of humans and animals, the following formula It discloses the use of a compound of 1. and R & lt 1 & gt Wherein, R 1 and R 2 is independently hydrogen Unsubstituted or substituted C 1 -C 12 alkyl Unsubstituted or substituted C 3 -C 12 cycloalkyl Unsubstituted or substituted C 6 -C 20 aryl Or unsubstituted or substituted C 2 -C 20 alkenyl R 3 is PO 3 R 1 R 2 COOR 6 COR 7 CONR 7 R 8 -SO 2 R 6 CN Unsubstituted or substituted C 6 -C 20 aryl R 4 is unsubstituted C 6 -C 20 aryl Or one or more C 1 -C 18 alkyl, C 1 -C 18 alkoxy, C 3 -C 12 cycloalkyl, hydroxy, amino, mono- or di -C 1 -C 18 alkylamino, - NR 10 COR 11 ) or (1a: is substituted by a radical of C 6 -C 20 aryl Or unsubstituted or substituted C 4 -C 20 heteroaryl R 5 is hydrogen Substituted or unsubstituted C 1 -C 20 alkyl Unsubstituted or substituted C 3 -C 12 cycloalkyl Unsubstituted or substituted C 6 -C 20 aryl Or unsubstituted or substituted C 4 -C 20 or heteroaryl Or R 4 and R 5 is to form a cycloaliphatic ring R 6 , R 7 and R 8 are independently selected from hydrogen Substituted by one or more E and / or one or more D, C , which may be through 1 -C 18 alkyl, C 3 -C 12 cycloalkyl Or G C which may be substituted by a 6 -C 20 or aryl Or R 7 and R 8 together form a 5 or 6 membered ring D is -CO- -COO- -S- -SO- -SO 2 - -O- -NR 9 - -SiR 12 R 13 - -POR 14 - -CR 15 = CR 16 - Or -C C-, and E is -OR 17 -SR 17 -NR 10 R 11 -NR 10 COR 11 -COR 11 -COOR 11 -CONR 10 R 11 -CN Halogen SO 3 R 18 SO 2 R 18 PO 3 (R 18 ) 2 Or PO 2 (R 18 ) 2 and G, E Optionally via a D C 1 -C 18 alkyl C 1 -C 18 to perfluoroalkyl Optionally
