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2M. K. Bromley, M. G. Looney, D. H. Solomon, R. W. Gable, M. Helliwell and P. Hodge.
1,5,7,11-Tetraoxaspiro[5.5]undecane, 3,9-Dimethylidene-1,5,7,11-tetraoxaspiro[5.5]undecane and 1,5-Dioxa-7,11-dithiaspiro[5.5]undecane, Acta Cryst. (1998). C54, 1019-1023Â Â Â Â