The Invention relates to a Crystalline form of agomelatine, N - [2 - (7 - methoxy - 1-naphthyl] acetamide), their Preparation and the use thereof.LA INVENCION SE REFIERE A UNA FORMA CRISTALINA DE LA AGOMELATINA, N-[2-(7-METOXI-1-NAFTIL)]ACETAMIDA, A SU PREPARACION Y AL USO DE LA MISMA.