abstract |
A compound of formula (I) or a salt thereof: ** (See formula) ** in which: R1 is n-C3-6 alkyl or C1-2 alkoxy-C1-2 alkyl; each R2 independently represents halo, OH or C1-3 alkyl; m is an integer that has a value of 4, 5, 6 or 7; n is an integer that has a value of 0, 1, 2 or 3; p is an integer that has a value of 0, 1 or 2; |