Patent ID: 8026110

Claim:
A rosamine derivative compound of the formula: wherein: X is O, NR 4 , or S; R 1 is NR 4 R 5 , OH, NR 4 R 6 , or R 2 is substituted or unsubstituted napthyl, wherein the substituted form of R 2 has one or more substituents independently selected from the group consisting of halogen, NR 4 R 5 , OR 7 , SR 4 , aryl, R 3 is H or with R 1 collectively forms a fused ring of the structure of R 4 is H or C 1 to C 6 alkyl; R 5 is H, C 1 to C 6 alkyl, or with R 4 collectively forms a ring structure; R 6 is (CH 2 ) n NR 4 R 8 ; R 7 is H, C 1 to C 6 alkyl, or aryl; R 8 is H or C 1 to C 6 alkyl; Y is alkyl or halogen; n is 1 to 3; m is 0 to 3; and * is a site on a substituent which binds to the rosamine derivative compound.