Patent ID: 7371874

Claim:
A 6-alkylamino-2-methyl-2′-(N-methyl substituted sulfonamido)methyl-2H-1-benzopyran compound represented by the formula 1: wherein R 1 is C 1 -C 10 alkyl; phenyl; phenyl substituted with a substituent selected from the group consisting of C 1 -C 6 alkyl, C 1 -C 6 acyloxy, C 1 -C 10 alkoxyalkyl and C 1 -C 10 dialkoxyalkyl; benzyl; benzyl substituted with a substituent selected from the group consisting of halogen, nitro, cyano, hydroxy, C 1 -C 6 alkyl and C 1 -C 6 alkoxy; phenethyl; pyridylmethyl; thiophenemethyl; or thiophenemethyl substituted with C 1 -C 6 alkyl, each of R 2 and R 3 is a hydrogen atom; or C 1 -C 6 alkyl and R 4 is C 1 -C 10 alkyl; phenyl; phenyl substituted with a substituent selected from the group consisting of halogen, C 1 -C 6 alkyl and C 1 -C 6 alkoxy; benzyl; or thiophene.