[N-(4-cyanophenyl)-N'-(diphenylmethyl)guanidine]acetic acid is a trisubstituted guanidine, carrying 4-cyanophenyl, diphenylmethyl and carboxymethyl substituents, which is known to act as a highly potent sweetening agent. It has a role as a sweetening agent and an epitope. It is a glycine derivative and a member of guanidines.