| http://www.w3.org/ns/prov#value | - The above alkyl and benzyl esters are alternatively prepared, and the esters wherein R is a conventional radical forming an ester which is hydrolyzable under physiological conditions are generally prepared, by reaction of a salt of the acid (I, R=H; preferably the tetrabutylammonium salt) with an appropriate compound containing a displaceable halide (iodide, bromide or chloride; generally preferre
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