Compounds of formula (I):in which R1, R2, R7, R8, R9, R10and A have the meanings given in the specification, are DP2 receptor modulators useful in the treatment of immunologic diseases.本發明關於一種下式(I)之化合物:其中R1、R2、R7、R8、R9、R10及A具有說明書所給之意義,該化合物係用於治療免疫學疾病之DP2受體調控劑。