Author's Organization：Institute of Pharmaceutical Sciences, Faculty of Medicine, Kyushu University Institute of Pharmaceutical Sciences, Faculty of Medicine, Kyushu University
It was definitely found that dehydroacetic acid had two kinds of crystals, one of which was α-form (monoclinic), stable at a low temperature, and the other was β-form (triclinic), stable at a high temperature. Transition from α-form to β-form occurred at 80°. Lattice constants and other crystal data of these two kinds of crystals were reported.
