Patent ID: 8048912

Claim:
A benzopyran derivative of Formula (1) or a pharmaceutically acceptable salt thereof: wherein Y is S or N—R 4 ; R 1 and R 4 are independently C 1 -C 20 alkyl, amine, substituted or unsubstituted phenyl, substituted or unsubstituted benzyl, isovaline(methylester), naphthyl, or phenyl-X-(wherein, X is carbonyl, or C 1 -C 6 alkyl), or R 1 and R 4 are fused together with the nitrogen atom to which they are attached to form a heterocycle having a 5- to 7-member ring; R 2 is hydrogen, or C 1 -C 5 alkyl; R 3 is hydrogen, C 1 -C 5 alkyl, substituted or unsubstituted phenyl, or substituted or unsubstituted benzyl; and wherein the substituted phenyl or the substituted benzyl is phenyl or benzyl substituted with 1 to 4 substituents selected from the group consisting of halogen, nitro, benzyloxy, C 1 -C 5 alkyl, C 1 -C 5 alkoxy, C 1 -C 5 haloalkyl, and C 1 -C 5 alkylsulfanyl.