Provided is a method of treating hypertension, which comprises administering an effective amount of a compound represented by the following formula (1) or (2): ##STR00001## wherein, R.sup.1 and R.sup.2 are the same or different and each independently represents hydrogen, alkyl, alkenyl, cycloalkyl, cycloalkenyl, alkoxyalkyl, aryl, alkylaryl, aralkyl, or acyl, R.sup.3 represents hydroxyl, ester bond residue, or amide bond residue, R.sup.4 represents ester bond residue or amide bond residue, or a pharmaceutically acceptable salt thereof (except ferulic acid).

 
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