KLEPP, K.O., CUTHBERTSON, A.S., FISCHER, P.M., SANDOSHAM, J, HARTMANN, M., HIEBL, J., KOLLMANN, H., KREMMINGER, P. and ROVENSZKY, F., 1999. The crystal structure of N,N’-bis-(1,3-dihydroxy-2-methylprop-2-yl)-pyrazine-2,3-dicarboxamide semihydrate Zeitschrift fuer Naturforschung. 54b(8), 1027-1032