| http://www.w3.org/ns/prov#value | - These conditions may optionally include the use of a substantially inert, normally liquid, organic solvent or diluent such as mineral oil, toluene, benzene, xylene or the like and an esterification catalyst such as toluene sulfonic acid, sulfuric acid., aluminum chloride, boron trifluoride-triethylamine, methane sulfonic acid, hydrochloric acid, ammonium sulfate, phosphoric acid, sodium methoxide
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