GCB is an organic disulfide that is L-685,458 in which the C-terminal amide group is coupled to a biotin moiety via a long linker containing the disulfide group. It has a role as an EC 3.4.23.46 (memapsin 2) inhibitor. It is an organic disulfide, a polyether, a secondary alcohol, a carbamate ester and a monocarboxylic acid amide. It is functionally related to a biotin and a L-685,458.