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Dehydrochlorinated poly(vinylidene chloride) proved to be a conjugated polyene-polyene polymer. Shock compression of the polymer formed a large portion of graphite and trace amounts of diamond and of an unknown carbon phase. The unknown carbon phase belongs to the hexagonal crystal system and possesses the cell dimension a0 = 0.338 nm. A comparison with known carbyne phases was made in terms of the crystalline parameters.