Bolton-Hunter reagent, monoiodinated. This product is used to iodinate proteins that do not contain tyrosine residues. Bolton-Hunter reagent is the N-hydroxysuccinimide ester of iodinated p-hydroxyphenylpropionic acid. The active ester acylates terminal amino groups with the iodinated p-hydxyphenylpropionic residue, effectively introducing radioactive iodine into proteins and peptides. A non-oxidative technique, it is less harsh to proteins than alternative labeling methods. An anhydrous benzene A charcoal trap is provided with each vial.