Claim 1: a compound of formula (1) where r u00b9 u1d43 represents H or carboxy and r u00b9 u1d47 represents H or r u00b9 and r u00b9 u1d47 together represent the Group * - C (o) - NH - Group # or S - * - C (OH) = N - S - # where * represents the Point Union r u00b9 u1d43 and # represents The Point of Union of r u00b9 u1d47； R u00b2 re C u2081 u208b u2083 is H, alkyl, Hydroxy alkyl c u2081 u208b u2083,Cycloalkyl benzyl or c u2083 u208b u2085； r u00b3 represents H or Halogen； n or u represents cr u2074； where r u2074 is c u2081 u208b u2083 represents H or alkoxy； b represents NH, CH, M is 1 or 2 and N represents 1 or 2； a represents n, B is absent, represents m 2 and N represents 2； and ch o n Q represents； and Represents o or s； or a Salt of the compound.Reivindicación 1: Un compuesto de fórmula (1) en donde R¹ᵃ representa H o carboxi y R¹ᵇ representa H, o R¹ y R¹ᵇ representan en conjunto el grupo *-C(O)-NH-S-# o el grupo *-C(OH)=N-S-# en donde * representa el punto de unión de R¹ᵃ y # representa el punto de unión de R¹ᵇ； R² representa H, alquilo C₁₋₃, hidroxi-alquilo C₁₋₃, bencilo o cicloalquilo C₃₋₅； R³ representa H o halógeno； U representa N o CR⁴； en donde R⁴ es H o alcoxi C₁₋₃； A representa CH, B representa NH, m representa 1 ó 2 y n representa 1 ó 2； o A representa N, B está ausente, m representa 2 y n representa 2； Y representa CH o N； y Q representa O ó S； o una sal de dicho compuesto.
