123456The present invention provides a compound having a specific chemical structure and having an exceptional inhibitory action on EZH1 and/or EZH2 activity or a pharmaceutically acceptable salt thereof. A compound having a 1 3 benzodioxole structure represented by general formula (I) a pharmaceutically acceptable salt thereof or a pharmaceutical composition containing such a compound. (R R R R R R and V in formula (I) are each as defined in the specification.).