The esterification of 2-butyl-4-chloro-1H-imidazole-5-carboxylic acid (I) with 1-chloroethyl ethyl carbonate (II) by means of sodium silanolate in HMPT gives the corresponding ester (III), which is condensed with 5-[4'-(bromomethyl)biphenyl-2-yl]-1-(triphenylmethyl)tetrazole (IV) by means of K2CO3 in hot DMF, yielding the tritylated final product (V). Finally, this compound is deprotected in refluxing methanol.