Patent ID: 8691972

Claim:
A compound of formula (I), or a tautomer thereof, or a derivative thereof, or a pharmaceutically acceptable salt of said compound or said tautomer or said derivative; wherein: X is tellurium; R 1 is linear or branched alkyl, or aryl; R 2 is selected from the group consisting of hydrogen, halogen, alkyl, aryl, hydroxyl, thiol, amino, alkyloxyl, aryloxyl, acyloxyl, alkylthiol, arylthiol, alkylseleno, arylseleno, alkyltelluro, aryltelluro, alkylamino, arylamino and acylamino; R 3 is selected from the group consisting of oxygen, sulfur, selenium, tellurium, amino, alkylamino, arylamino and acylamino; R 4 is selected from the group consisting of hydrogen, halogen, alkyl, aryl, hydroxyl, thiol, alkylthiol, arylthiol, oxygen, sulfur, selenium, tellurium, amino, alkylamino, arylamino and acylamino; R 5 and R 6 are each independently selected from the group consisting of hydrogen, halogen, alkyl, aryl, hydroxyl, thiol, amino, alkyloxyl, aryloxyl, acyloxyl, alkylthiol, arylthiol, alkylamino, arylamino and acylamino; and n and m are a subscript selected from 0 to 20.