Patent ID: 7259167

Claim:
A tryptanthrin compound having the following structural formula (IV) wherein A, B, C, and D are each independently selected from the group consisting of C, N, and S; R 1 and R 2 are each independently selected from the group consisting of polyamines, polyethers and —L-R 3 wherein R 3 is substituted or unsubstituted substituted or unsubstituted, substituted or unsubstituted wherein X is one or more substituents selected from the group consisting of alkyl, hydroxyl, alkoxy, acyl, amino, alkylamino, dialkylamino, alkoxycarbonyl, carboxyl, carbamoyl, alkylaminocarboxyl, dialkylaminocarboxyl, alkylthio or mercapto and L is a linker selected from the group consisting of alkyl, alkylamino, dialkylamino, alkoxyl, alkoxycarbonyl, alkylaminocarbonyl, dialkylaminocarbonyl, alkylthio, and carbamoyl groups and wherein L contains about 2 to about 18 carbon, nitrogen, oxygen or sulfur atoms in its chain.