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Abstract 1,4‐Diphenyl‐1,3‐butadiene, 1,6‐diphenyl‐1,3,5‐hexatriene and 1,8‐diphenyl‐1,3,5,7‐octatetraene have each both a monoclinic and an orthorhombic modification of which lattice constants and some optical data are given.
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Drenth et al. (1953) studied this question.
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