CsHI6N20 7 is monoclinic, space group C2, with a = 15. solved by the direct method using three-dimensional X-ray data and refined by the least-squares method to a final R = 0.100 for 849 observed reflexions. In the crystal, a glucosyl part linked to the neighbouring glucosyl moieties by four different hydrogen bonds forms 0567-7408/81 / 112026-04501.00 a double layer parallel to the (001) plane, and the aglycone parts are stretched in a direction perpendicular to the layers and have van der Waals contacts with other molecules.

-2-Chloro-, 2-methoxy-, and 2-amino-1-azaazulenium 1-methylides and 1,3-diazaazulenium 1-methylide were generated by the treatment of the

-2-Chloro-, 2-methoxy-, and 2-amino-1-azaazulenium 1-methylides and 1,3-diazaazulenium 1-methylide were generated by the treatment of the

Crystals of cycasin were grown from solution in absolute ethyl alcohol at 0°C. The unit cell is monoclinic P2ffc, with crystal data" a = 15"754 _+0"001, b = 9.708 _+0-001, c = 15"422 _+ 0-001 A, fl = 109"83 _+ 0.005 °, Z = 8, D,, = 1"49, Dx = 1.51 g cm-3.