Assertion: guanine's form | /r/HasAspect | symmetric hydrogen bonds
Facets:
value: due to severe steric constraint
type: CAUSE
Source sentences:
text: Due to severe steric constraint, the protonated form of Proton Sponge (1,8-bis(dimethylamino)naphthalene) and its derivatives also have symmetric hydrogen bonds ([N--H--N]+), although in the case of protonated Proton Sponge, the assembly is bent.