Patent ID: 8492379

Claim:
A compound of formula (III) wherein R 12 and R 13 are each independently selected from the group consisting of H, benzyl, C 1 -C 10 alkyl, C 2 -C 10 alkenyl, C 2 -C 10 alkynyl, aryl and heteroaryl, each of which may optionally be substituted with one or more of halo or C 1 -C 6 alkyl; or R 12 and R 13 , together with the nitrogen to which they are attached, form an optionally substituted heterocyclic ring having between 3 and 7 ring members; R 14 , R 15 ,R 16 , R 17 and R 18 are each independently H, halo, OH, NO 2 , optionally substituted alkyl, optionally substituted alkoxy, optionally substituted alkenyl, optionally substituted alkynyl, optionally substituted aryl, optionally substituted heteroaryl, optionally substituted NHC 1-6 alkyl, optionally substituted SC 1-6 alkyl, COOR 22 , (CH 2 ) n OR 22 or an optionally substituted polyether; R 19 and R 21 are each independently halo, OH, NO 2 , optionally substituted alkyl, optionally substituted alkoxy, optionally substituted alkenyl, optionally substituted alkynyl, optionally substituted aryl, optionally substituted heteroaryl, optionally substituted NHC 1-6 alkyl, optionally substituted SC 1-6 alkyl, COOR 22 , (CH 2 ) n OR 22 or an optionally substituted polyether; R 20 is H, halo, OH, NO 2 , optionally substituted alkyl, optionally substituted alkoxy, optionally substituted alkenyl, optionally substituted alkynyl, optionally substituted aryl, optionally substituted heteroaryl, optionally substituted NHC 1-6 alkyl, optionally substituted SC 1-6 alkyl, COOR 22 , (CH 2 ) n OR 22 or an optionally substituted polyether; R 22 is optionally substituted alkyl; and n is an integer from 1 to 6; or a salt or solvate thereof.