摘要 |
A compound of formula (I): in free or salt form, wherein A, R<SUP>1</SUP>, R<SUP>3</SUP>, Q<SUP>a</SUP>, Q<SUP>b</SUP> and Q are as defined herein, for the treatment of a disease mediated by the S1P2 or S1P3 receptor, such as inflammatory or obstructive airways disease. |