Rko. Sigel et al., IF WATSON-CRICK AND HOOGSTEEN SITES OF GUANINE ARE BLOCKED, HYDROGEN-BONDING WITH CYTOSINE IS VIA N-2 AND N-3, Chemical communications, (2), 1998, pp. 219-220
A novel hydrogen bonding scheme between cytosine and guanine nucleobas
es is observed if both N-1 and N-7 positions of the guanine are blocke
d by a metal entity and a methyl group, respectively.