The present invention is directed to a new class of triazine derivatives as described by formula I below in which A, X, R
1
, R
2
, R
3
, and R
4
are as defined herein and to the use of the compounds as PDE10 inhibitors.
[EN] PHTHALAZINONE DERIVATIVE, AND PREPARATION METHOD AND USE THEREOF<br/>[FR] DÉRIVÉ DE PHTALAZINONE, ET PROCÉDÉ DE PRÉPARATION ET UTILISATION ASSOCIÉS<br/>[ZH] 酞嗪酮衍生物、其制备方法及用途