<p>Novel xanthine compounds represented by the following formula: <CHEM> wherein each of R<1> and R<2> independently represents allyl or propargyl; R<3> represents hydrogen or lower alkyl; each of X<1> and X<2> independently represents oxygen or sulfur; Y represents a single bond or alkylene, and n represents 0 or 1; and pharmaceutically acceptable salts thereof have a diuretic effect and a renal-protecting effect.</p>
