<p>Disclosed is an agent for prevention or treatment of cardiovascular diseases. Specifically disclosed is an atropisomer of a compound represented by the following general formula (I). [chemical formula 1] (In the formula, R<SUP>1</SUP> represents a C<SUB>1</SUB>-C<SUB>3</SUB> alkyl group or a hydroxy C<SUB>1</SUB>-C<SUB>3</SUB> alkyl group; and R<SUP>2</SUP> represents a hydrogen atom or a C<SUB>1</SUB>-C<SUB>3</SUB> alkoxy group.)</p>
