(+/-)-(3 ' a alpha,4 'alpha,6 ' a alpha)-3 ',3 ' a,4 ',6 ' a-tetrahydro-5,5,N,N-tetramethylspiro[1,3-dioxane-2,2 '(1 ' H)-pentalene]-4 '-acetamide, atriclinic crystal structure with local monoclinic pseudosymmetry

The crystal packing in the title compound, C17H27NO3, shows layers with loc al pseudo-monoclinic symmetry. The two independent molecules are related by local non-crystallographic glide planes and screw axes. Adjacent layers ar e displaced by a distance of about 1.61 Angstrom in the a direction, result ing in an overall triclinic symmetry of the structure.