Patent ID: 8268854

Claim:
A compound according to Formula (I): or isomers, or salts thereof; wherein X 4 , X 5 , and X 8 are CH, X 6 may be N, + NR 6 or CR 6 , and X 7 may be N, + NR 6 or CR 7 , and wherein either X 6 or X 7 is N; wherein X 9 is NH; wherein R 3 is CO 2 R, or OR 1 or COR; wherein R 6 and R 7 are independently H, X, —C≡CR 2 , lower alkyl, lower alkenyl, or lower alkynyl; wherein R is —C(CH 3 ) 3-n (CF 3 ) n , —C(CH 3 ) 3-r (CH 3-p X p ) r , —CH(CH 3 ) 2-m (CF 3 ) m , or —CH(CH 3 ) 2-t (CH 3-p X p ) t ; wherein R 1 is —CH 2 CH 2 CH 3 , —CH(CH 3 ) 2 , —CH 2 CH 2 CH 2 CH 3 , —CH 2 CH(CH 3 ) 2 , —CH(CH 3 )CH 2 CH 3 , —CH 2 CH 2 CH 2 CH 2 CH 3 , —CH 2 CH 2 CH(CH 3 ) 2 , —CH 2 CH(CH 3 )CH 2 CH 3 , or —CH(CH 3 )CH 2 CH 2 CH 3 , wherein any of the hydrogens of R 1 may be replaced by X; wherein R 2 is H, lower alkyl, Me 3 Si, Et 3 Si, n-Pr 3 Si, or i-Pr 3 Si; wherein n is an integer from 0 to 3, m is an integer from 0 to 2, r is an integer from 1 to 3, p is an integer from 1 to 2, and t is an integer from 0 to 2; and wherein X is independently selected from F, Cl, Br and I.