Patent ID: 7902191

Claim:
A compound structurally represented by Formula I or a pharmaceutically acceptable salts thereof, wherein: R 1 is R 2 is wherein; R 3 is hydrogen, —(C 1 -C 4 ) alkyl, R 4 is —(C 1 -C 4 ) alkyl, —(C 1 -C 4 ) alkylene-phenyl, wherein R 3 and R 4 can cyclize to form, together with the nitrogen to which they are attached, a five or six-membered ring, wherein optionally one of the carbons of the ring formed by said nitrogen, R 3 , and R 4 , is replaced by a nitrogen or oxygen, and wherein said ring is optionally further substituted by R 5 , and R 5 is hydrogen, —(C 1 -C 4 ) alkyl, wherein optionally R 5 forms a 3 to five membered ring with the nitrogen containing ring to which it is attached, —(C 1 -C 4 ) alkylene-N-pyrrolidinyl, —(C 1 -C 4 ) alkylene-N-piperidinyl.