2'-alpha-mannosyl-L-tryptophan is a C-glycosyl compound that is L-tryptophan in which the hydrogen at position 2 on the indole protion has been replaced by an alpha-mannosyl residue. It is a L-tryptophan derivative and a C-glycosyl compound. It is functionally related to an alpha-D-mannose. It is a tautomer of a 2'-alpha-mannosyl-L-tryptophan zwitterion.