Compounds useful as shuttles through the blood brain barrier and shuttle-cargo constructs.Compounds of formula (I) wherein, R {1} {2} and R_ R_ {3} are independently selected from: H and (CH 2 {}) _ {{q} -R 6}, {4} R is a C-radical derived from one of the known ring systems with 1-4 rings {5} R is H or CH 3} {CO- R {6} is a C-radical derived from one of the known ring systems with 1-2 rings X is selected from -NH- (CH 2 {})} _ {r -CO-, -CO (CH 2 {}) _ {r} CO-, -S- (CH 2 {}) _ {r} - , -S- (CH 2 {})} _ {r -CO-, -O- (CH 2 {}) _ {r} - and -O- (CH 2 {}) _ {r} -CO- Y is -NH {2}, -OH, -OR 7} or { -NHR_ {7} k is an integer from 0 to 1 m is an integer from 0 to 1 n is an integer from 2 to 10 q is an integer from O to 1 r is an integer from 1 to 3 R {7} is a radical (C {1} {6} -alkyl) - alkyl with the proviso that at least one R radical selected from R {1} {2} and R_ R_ {3} is (CH 2 {}) _ {q} {6} -R and with the proviso that when X is -CO (CH 2 {}) _ {r} CO-, r {5} is H, they are useful as shuttles through the blood brain barrier (BBB). The BBB-shuttle-cargo, constructs are useful as medicines.1Compuestos útiles como lanzaderas a través de la barrera hematoencefálica y construcciones lanzadera-cargo.Compuestos de fórmula (I), donde, R1 R2 y R3 son independientemente seleccionados entre: H y un (CH2)q-R6, R4 es un C-radical derivado de uno de los sistemas de anillo conocidos con 1-4 anillos R5 es H o CH3CO- R6 es un C-radical derivado de uno de los sistemas de anillo conocidos con 1-2 anillos X se selecciona entre -NH-(CH2)r-CO-, -CO(CH2)rCO-, -S-(CH2)r-,-S-(CH2)r-CO-, -O-(CH2)r- y -O-(CH2)r-CO- Y es -NH2, -OH, -OR7 o -NHR7 k es un entero de 0 a 1 m es un entero de 0 a 1 n es un entero de 2 a 10 q es un entero de O a 1 r es un entero de 1 a 3 R7 es un radical (C1-C6)-alquilo con la condición de que al menos un radical R seleccionado entre R1 R2 y R3 es (CH2)q-R6 y con la condición de que cuando X es -CO(CH2)rCO-, R5 es H, son útiles como lanzaderas a través de la barrera hemat
