Abstract. CI4HI6N202, M r= 244.30, monoclinic, P2Jc, for both isomers. E-isomer: a=8.203 (7), b=8-278(7), c=18.939 (9) Owing to the presence of methyl groups in the ortho positions of the benzene ring, the plane of this ring is rotated away from that of the imidazolidine-2,4-dione ring but the angle of rotation is smaller in the case of the E-isomer at 57.1 (3) ° than in the case of the Z-isomer in which the two planes are almost perpendicular at 84.2 (3) ° .
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