1,3,2-Benzodioxaphosphole, 2-(2-naphthyloxy)- 2-(2-Naftyloxy)-1,3,2-dioxafosfaindan [Czech] 2-(2-Naphthyloxy)-1,3,2-dioxophosphaindan DF4366100 Phosphorous acid, cyclic o-phenylene 2-naphthyl ester beta-Naftolfosfit [Czech] beta-Naphthol phosphite