Patent ID: 7125814

Claim:
A bis-o-nitrophenol derivative comprising a compound having a Formula Ia: wherein: R 2 is a substituent independently selected from the group consisting of a hydrogen atom and a tert-butoxycarbonyl group of formula II: wherein R 3 , R 4 , and R 5 are selected from the group consisting of: —F, —(CH 2 ) n —CH 3 , —(CF 2 ) n —CF 3 , with n being an integer from 0 to 10, and wherein at least one of the radicals R 2 is a tert-butoxycarbonyl group of Formula II; and Z is a connector selected from the group consisting of a carbon-carbon single bond, a carbon-carbon bond common to both of said phenyl groups carrying said nitro and one of said OR 2 groups, a divalent alkyl radical with from 1 to 20 carbon atoms, a divalent aryl radical with from 6 to 20 carbon atoms, and a divalent aralkyl radical.