The crystal structure of 3, 4-methylenedioxy-cinnamoyl piperidide, a clinical an-tiepiletic remedy, was determined. The molecular formula is C15H17O3N1. The crystal belongs to the orthogonal system. The space group is D24-P21 21 21. The lattice parameters are: α = 24.338 (4)?, b = 8.558 (2)?, c = 6.217 (2)?, and Z = 4. The intensity data were collected on PW-1100 automated four-circle diffractormeter. The structure was solved by the direct method (MULTAN-78), R =0.2469. The significance of the structural determinations of Cinnamamides was also discussed.