| abstract |
According to the present invention, crystals comprising (2R)-2-propyloctanoic acid and an amine, which can be used as bulk drugs for safely orally administrable solid preparations with keeping the pharmacological effect, are provided. Among these crystals, the crystal with dibenzylamine per se is particularly useful as bulk drug for pharmaceuticals and can be used as an intermediate to produce (2R)-2-propyloctanoic acid having an optical purity of more than 99.5% e.e. which has not been obtained. |