Patent ID: 7902190

Claim:
An indole derivative represented by the following Chemical Formula 1 or a pharmaceutically acceptable salt thereof: wherein, R 1 is one selected from a group consisting of COOR a , CONR b R c and C 1 ˜C 4 alkyl, wherein R a is H or C 1 ˜C 4 alkyl, and R b and R c are independently selected from a group consisting of C 1 ˜C 5 alkyl bearing a 5-7 atom-membered heteroalkyl group containing N, O or S or a 5-7 atom-membered heterocyclic group containing N, O or S; H; and C 1 ˜C 5 alkyl; R 2 is selected from a group consisting of C 5 ˜C 7 aryl C 1 ˜C 5 alkyl, di-C 1 ˜C 5 alkylamino C 1 ˜C 5 alkyl, C 1 ˜C 5 alkylcarbonyl, C 1 ˜C 5 alkyl C 1 ˜C 5 alkoxycarbonyl, C 5 ˜C 7 aryl C 1 ˜C 5 alkylsulfonyl, and thiophene C 1 ˜C 5 alkylsulfonyl; and the symbol designates a single bond or a double bond.