Patent ID: 8168621

Claim:
A compound of the structure: wherein: R 1 , R 2 , R 3 , R 4 are independently selected from the group consisting of H, C 1 -C 6 alkyl, substituted alkyl, and halogen; R 5 is selected from the group consisting of —NH 2 , —NH(CH 2 ) n OH, —NH(CH 2 ) n —COOsalt, —(NH)CH 2 OHCH 3 , —NHCOOH, and —CH 2 NHCOOH; n is an integer from 1-7; R 6 is selected from a group consisting of H, a C 1 -C 6 alkyl, a C 1 -C 6 substituted alkyl, a sulfate, a glucoronide, a phenyl or a substituted phenyl group, a cyclo- or heterocyclo group, and R 7 is selected from the group consisting of H, a C 1 -C 6 alkyl, a C 1 -C 6 substituted alkyl, a halogen, a halogenated alkyl, a sulfate, a glucoronide, —SO 2 NH 2 , —COOH, —CN, —CHO, —COO salt and —NH 2 ; and wherein the symbol represents either a single or a double bond with the proviso that when the symbol is a double bond and forms a keto group at position 17, then no R 6 is present.