DERIVADOS DE FENETANOLAMINA

REIVINDICACION NUMERO UN COMPUESTO DE LA FORMULA GENERAL (I): FIGURA 1 CARACTERIZADO PORQUE R1 REPRESENTA UN GRUPO ARILO OPCIONALMENTE SUSTI- TUIDO POR UNO O MAS SUSTITUYENTES, SELECCIONADOS DE HALO, HIDROXI, ALCOXI DE 1 A 6 ATOMOS DE CAR- BONO, ALQUILO DE 1 A 6 ATOMOS DE CARBONO, NITRO, CIANO, HIDROXIMETILO Y TRIFLUOROMETILO; R2 REPRESENTA H o ALQUILO DE 1 A 6 ATOMOS DE CARBONO; R3 REPRESENTA UN GRUPO FENILO O HETEROARILO SUS- TITUIDO POR R6 Y R7; R4 Y R5 CADA UNO REPRESENTA INDEPENDIENTEMENTE H o ALQUILO DE 1 A 6 ATOMOS DE CARBONO o, R4 Y R5 CONJUNTAMENTE FORMAN UN GRUPO CICLOALQUILO DE 3 A 6 ATOMOS DE CARBONO; R6 REPRESENTA ZCH2CO2H Y R7 REPRESENTA H o ZCH2CO2H, o R6 Y R7 CONJUNTAMENTE REPRESENTAN UN GRUPO FIGURA 2 EN DONDE CADA Z PUEDE SER EL MISMO O DIFERENTE, Y SE SELECCIONA DE UN ENLACE, CH2,O, S o NR9; R8 ES H o CO2H; R9 ES H O ALQUILO DE 1 A 6 ATOMOS DE CARBONO; X REPRESENTA (CH2)n, DONDE n ES 1 o 2; Y DERIVADOS FISIOLOGICAMENTE ACEPTABLES DE LOS MISMOS". The present invention relates to phenethanolamine derivatives of formula (I), wherein: R represents an aryl group optionally substituted by one or more substituents selected from halo, hydroxy, C1-6alkoxy, C1-6alkyl, nitro, cyano, hydroxymethyl and trifluoromethyl; R represents H or C1-6alkyl; R represents a phenyl or heteroaryl group substituted by R and R ; R and R each independently represent H or C1-6alkyl or, R and R together form a C3-6cycloalkyl group; R represents ZCH2CO2H and R represents H or ZCH2CO2H, or R and R together represent a group (a), wherein each Z may be the same or different and is selected from a bond, CH2, O, S or NR , R is H or CO2H and R is H or C1-6alkyl; X represents(CH2)n where n is 1 or 2; and pharmaceutically acceptable derivatives thereof; to processes for their preparation; and their use in the treatment of conditions susceptible of amelioration by an atypical beta-adrenoceptor agonist.