Patent ID: 7442798

Claim:
A compound of formula I wherein: R 1 -R 4 are independently H, alkyl, alkenyl, alkynyl, OH, NH 2 , SH, O—R 6 , N—R 7 R 8 , -or a halogen; R 5 is SH, OH, O—R 6 , or N—R 7 R 8 ; R 6 is H or C 1 -C 4 alkyl; R 7 and R 8 are independently H or C 1 -C 4 alkyl; X is S,O, or N—R 9 ; Y is N—R 9 ; R 9 is H or C 1 -C 4 alkyl; Q has formula IA wherein: R 10 -R 13 are independently H, C 1 -C 4 alkyl, OH, NH 2 , SH, O—R 25 , N—R 26 R 27 , or a halogen, or R 10 and R 11 taken together form a carbonyl, a sulfonyl or an imino moiety, or R 12 and R 13 taken together form a carbonyl, a sulfonyl or an imino moiety; R 14 -R 24 are independently H, C 1 -C 4 alkyl, OH, NH 2 , SH, O—R 25 , N—R 26 R 27 , or a halogen; R 25 is H or C 1 -C 4 alkyl; and R 26 and R 27 are independently H, C 1 -C 4 alkyl, O, or S; and salts thereof.