Compound of Formula (I) ** Formula ** or a stereoisomer or a pharmaceutically acceptable salt thereof; where: R1 is SO3M; M is hydrogen or a cation; R2 is: (a) hydrogen, (CH2) n-R3, or COOR3, n is 0, 1 or 2; R3 is: (a) hydrogen, (b) C1-C6 alkyl substituted with heterocyclyl, said heterocyclyl being substituted with one or more substituents chosen from the group consisting of C1-C6 alkyl, halogen, CN, COOH, CONH2, OH, NH2 and NHCOCH3.Compuesto de Fórmula (I)**Fórmula** o un estereoisómero o una sal farmacéuticamente aceptable del mismo; donde: R1 es SO3M; M es hidrógeno o un catión; R2 es: (a) hidrógeno, (CH2)n-R3, o COOR3, n es 0, 1 o 2; R3 es: (a) hidrógeno, (b) alquilo C1-C6 sustituido con heterociclilo, estando dicho heterociclilo sustituido con uno o más sustituyentes elegidos del grupo que consiste en alquilo C1-C6, halógeno, CN, COOH, CONH2, OH, NH2 y NHCOCH3.