Abstract
New models are proposed for the two lyotropic liquid crystal phases of the anti-asthmatic drug, disodium cromoglycate (DSCG). It is suggested that the M phase consists of square hollow cylinders of DSCG packed in a hexagonal array in a water continuum. Each hollow cylinder consists of a stack of rings of four DSCG molecules and is filled with water. The N phase, which occurs at higher dilution, is pictured as a nematic array of the same hollow cylinders but separated by so much water that although the local parallelism is retained, the hexagonal ordering is lost.

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