A monophosphorylated L-dopa ester of formula
 (wherein the asterisk, R, R₁, R₂ and R₃ have the meanings shown in the description),
salts thereof with pharmaceutically acceptable acids or bases, a process for the preparation thereof and a pharmaceutical composition containing said compound or a salt thereof are described.
The compound of formula I and the salts thereof are useful in the treatment of Parkinson's disease, renal failure, heart failure and hypertension.  
                            一种单
磷酸化 
L-多巴酯,其式为
 (其中星号、R、R₁、R₂ 和 R₃ 的含义如说明书所示)、
描述了其与药学上可接受的酸或碱的盐类、其制备工艺以及含有所述化合物或其盐的药物组合物。
式 I 的化合物及其盐类可用于治疗帕
金森病、肾功能衰竭、心力衰竭和高血压。