The invention relates to a compound which is an indane derivative according to Formula (I), or a pharmaceutically acceptable salt thereof, [FORMULA (I)] wherein R1, R2, R3, n, R4, p, q, L, X and m are as defined herein. The compounds are useful in the treatment of antibacterial infection either as stand alone antibiotics, or in combination with further antibiotics. The compounds can also be used in vitro, for example in cleaning compositions.