Robuta

https://www.ncbi.nlm.nih.gov/Structure/pdb/1BXH 1BXH: CONCANAVALIN A COMPLEXED TO METHYL ALPHA1-2 MANNOBIOSIDE Concanavalin-ACALCIUM IONMANGANESE (II) IONmethyl alpha-D-galactopyranosidemethyl alpha-D-mannopyranoside concanavalin amethyl