The synthesis of a drug containing a-n-acetylpropyl fluoro-micropolymer (NAGLU) recombinant protein includes: (1) a NAGLU domain, which contains a series of amino acids, SEC ID 1; (2) a part of lisosomal target, which is an IGF-II porcion, which is composed of SEC number 3; and (3) a can between the two. The part of NAGLU domain and lisosomal target includes the amino acid sequence of SEC No. 6 This combination is managed within the library and results in the provision of protein NAGLU in one or more brain tissue targets, such as gray matter, white matter, near heart area, PIA aracnicos,There are others It is useful in the treatment of sindrome.REFERIDO A UNA COMPOSICION FARMACEUTICA QUE COMPRENDE UNA PROTEINA DE FUSION ALFA-N-ACETILGLUCOSAMINIDASA (Naglu) RECOMBINANTE QUE COMPRENDE: (i) UN DOMINIO NaGlu QUE COMPRENDE UNA SECUENCIA DE AMINOACIDOS SEC ID N° 1; (ii) UNA PORCION DE OBJETIVO LISOSOMAL LA CUAL ES UNA PORCION IGF-II QUE COMPRENDE SEC ID N° 3; ADEMAS (iii) UN ENLAZADOR ENTRE EL DOMINIO NaGlu Y LA PORCION DE OBJETIVO LISOSOMAL, EL CUAL COMPRENDE UNA SECUENCIA DE AMINOACIDO DE SEC ID N° 6. DICHA COMPOSICION ES DE ADMINISTRACION INTRATECAL Y RESULTA EN EL SUMINISTRO DE LA PROTEINA NaGlu EN UNO O MAS TEJIDOS CEREBRALES OBJETIVOS TALES COMO MATERIA GRIS, MATERIA BLANCA, AREAS PERIVENTRICULARES, PIA-ARACNOIDES, ENTRE OTROS. SIENDO UTIL EN EL TRATAMIENTO DEL SINDROME DE SANFILIPPO TIPO B (SAN B).