The invention is directed to certain novel compounds. Specifically, the invention is directed to compounds of formula (I): and salts thereof. The compounds of the invention are inhibitors of kinase activity, in particular PI3-kinase activity.本發明係關於某些新穎化合物。具體而言,本發明係關於一種式(I)化合物:及其鹽。本發明之化合物係激酶活性(尤其PI3-激酶活性)之抑制劑。