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Two new symmetric chromophores: 2, 8-bis-[(2-4'-ethoxy phenyl-5-4'-styryl)-1, 3, 4-oxadiazole] didibenzothiophene (abbreviated as SO-G1) and 2, 8-bis-[(2-4'-ethoxy phenyl-5-4'-styryl)-1, 3, 4-oxadiazole]-N-ethyl carbazole (abbreviated as N