The present invention comprises a compound for the prevention and/or treatmentof cardiovascular diseases. Thecompound is an atropisomer of a compound represented by the following generalformula (I ) : wherein R1 represents a C1-C3alkyl group; R2 represents a 2-hydroxy- C4-C6 alkyl group; R3 represents ahalogeno group, a halogeno-C1-C3 alkyl group andthe like; R4 represents a hydrogen atom, a halogeno group and the like; R5represents a C1-C3 alkyl group; and R6 represents ahydrogen atom, a halogeno group and the like] or atropisomers thereof.