Patent ID: 8440842

Claim:
A compound of formula (I) or a salt thereof, wherein R 1 is NO 2 ; R 2 is NO 2 , a mono-, di- or trifluorinated methyl, Cl, F or Br; R 3 and R 4 are independently from each other H or a saturated or unsaturated, linear or branched aliphatic radical having 1-3 chain members; R 5 is H, a saturated or unsaturated, halogenated or unhalogenated, linear or branched aliphatic radical having 1-7 chain members; R 6 is a radical: wherein X is a saturated or unsaturated, halogenated or unhalogenated, linear or branched aliphatic radical having 1-5 chain members, and; R 14 and R 15 are, independently from each other H or a linear or branched aliphatic radical having 1-5 chain members.