1-(Bromomethyl)-2,3,4,5,6-pentadeuteriobenzene; 2,3,4,5,6-Pentadeuteriobenzyl bromide,1-(Bromomethyl)-2,3,4,5,6-pentadeuteriobenzene,Isotope labelled benzyl bromide is a compound used in organic synthesis for the introduction of the benzyl protecting group for alcohols and carboxylic acids.,Benzene Stable isotope Reagent