Patent ID: 7368575

Claim:
6-alkylamino-2,2-disubstituted-7,8-disubstituted-2H-1-benzopyran compound of formula 1 or an isomer thereof: wherein R 1 is C 1 ˜C 10 alkyl, benzyl or substituted benzyl, phenethyl, 2-pyridinylmethyl, 2-thiophenemethyl, 5-methyl-2-thiophenemethyl, 3-thiophenemethyl, indolylmethyl, benzodioxoranylmethyl, naphtalenylmethyl, or furanylmethyl; R 2 and R 3 are hydrogen, C 1 ˜C 5 alkyl, halogen, or phenyl and substituted phenyl, respectively; R 4 and R 4 is C 1 ˜C 10 alkyl, phenyl or substituted phenyl; and the phenyl or heterocycle is substituted with 1˜4 substltuents selected from the group consisting of C 1 ˜C 6 alkyl, C 1 ˜C 6 haloalkyl, halogen, nitro, cyano and C 1 ˜C 6 alkoxy, n is an integer ranging from 1 to 5.