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The mesophases of several oddly shaped mesogenic diamides of 1,3-diaminobenzene, substituted with three methyl groups in positions 2,4,6 or by a methyl and a tert-butyl group in positions 2,5 have been studied by X-ray diffraction. Limello-columnar and uncommon nematic mesomorphic ordering have been observed and the role of hydrogen bonding in the phase behavior investigated.