A compound having the structureR—Ywherein R is, for example,Y is selected from the group consisting of 1) R5,2) —C(R1R2)(C(R3R4))0-1Y1R5, and3) —C(R1R2)—O—Y1R5；R1, R2, R3 and R4 are independently selected from the group consisting of hydrogen and C1-4 alkyl；R5 isY1 is selected from the group consisting of —C(O)—O— and —P(O)(OR6)—O—； andR6 is hydrogen or CH3,or a pharmaceutically acceptable salt thereof, and methods of using the compounds for treating hypertension.
