to which they are bound form a five or six membered heterocycle comprising one or two heteroatoms selected from the group consisting of nitrogen and oxygen hydrogen c 1 6 alkyl or u2014 c 1 6 alkylene nr k r l wherein r k and r l are each independently hydrogen or c 1 6 alkyl or r i and r j together with the nitrogen to which they are bound form a five or six membered heterocycle comprising one or two heteroatoms selected from the group consisting of nitrogen and oxygen c 1 6 alkoxy cn oh coor n or c o nr o r p r 12 and r 12 u2032 are each independently hydrogen c 1 6 alkoxy c 1 6 alkyl halo halo c 1 6 alkoxy halo c 1 6 alkyl or nitro r 13 r 13 u2032 and r 14 are each independently hydrogen c 1 6 alkoxy c 1 6 alkyl halo halo c 1 6 alkoxy or nitro c 1 6 alkyl optionally substituted by cn or oh or u2014 c 1 6 alkylene c o u2014 nr a r b wherein r a and r b are each independently hydrogen or c 1 6 alkyl r 2 is hydrogen or c 1 6 alkyl r 3 is hydrogen r 4 is hydrogen or halo r 5 is hydrogen r 6 is hydrogen c 1 6 alkyl optionally substituted by cn or.