H. Kagechika et al., STERICAL PROPERTIES OF N,N'-DIMETHYLUREA MOIETY ENHANCE FORMATION OF TRIPLY HYDROGEN-BONDED COMPLEXES, Chemical and Pharmaceutical Bulletin, 44(2), 1996, pp. 460-462
N,N'-Dimethyl-N,N'-[2-(3-methylureido)pyrid-5-yl] urea (5) was designe
d and synthesized as a guanylyl-guanosine equivalent molecule. (E)-Pre
ference of the urea bond of 5 enhanced the formation of highly associa
ted complexes of 5 with bis(cytosyl) derivatives.