| abstract |
(57) [Summary] The present invention provides a novel benzopyran or thiobenzopyran derivative represented by the following general formula (1), a pharmaceutically acceptable salt or stereochemical isomer thereof, a method for producing the same, and a compound represented by the general formula (1) The present invention relates to a pharmaceutical composition having anti-estrogen activity, comprising a compound of formula (I) as an active ingredient: Wherein X, R 1 , R 2 , R 3 , R 4 and A are as defined in the specification. |