The present invention is directed to N-hydroxyamidino compounds which are modulators of indoleamine 2,3-dioxygenase (IDO), as well as compositions and pharmaceutical methods thereof.La présente invention concerne des composés N-hydroxyamidino qui sont des modulateurs dindoléamine 2,3-dioxygénase (IDO), ainsi que des compositions et des procédés pharmaceutiques contenant ceux-ci.