抄録
The X-ray powder diffraction peaks of the β-form of 2, 9-dimethyl-5, 7, 12, 14-tetrahydroquino[2, 3-b]acridine-7, 14-dione [1] were indexed on the basis of a monoclinic unit cell with dimensions a=17.62, b=3.60, c=12.74 A and β=115.1°, which are very similar to those of the γ-form of 5, 7, 12, 14-tetrahydroquino[2, 3-b]acridine-7, 14-dione 2 The diffraction intensities of the β-form of [1] were also simulated by modifying the atomic parameters of γ-form of [2] slightly.
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