The crystal structure of the emptied clathrate form (delta(e) form) of syndiotactic polystyrene, obtained by removing the guest molecules from different clathrate delta forms, is presented. Chains in s(2/1)2 helical conformation are packed in the monoclinic unit cell with axes a = 17.4 Angstrom, b = 11.85 Angstrom, c = 7.70 Angstrom, and gamma = 117 degrees according to the space group PS1/a. The crystalline density of the emptied clathrate form (0.977 g/cm(3)) is lower than that of the amorphous phase (1.055 g/cm(3)). The differences between the structures of the emptied clathrate form and clathrate delta forms are discussed by the analysis of X-ray diffraction patterns and packing energy calculations.