| http://www.w3.org/ns/prov#value | - A compound of the formula V can be prepared from a compound of the formula VI by reaction with methanol in the presence of an acid such as sulfuric acid or gaseous hydrochloric acid at a temperature between 22??? C. and reflux for a period of 4 to 24 hours; preferably gaseous hydrochloric acid at 22??? C. for 24 hours.
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