| http://www.w3.org/ns/prov#value | - Compound (15) having the following general formula (15): ##STR33## wherein M is an alkali metal is obtained by treating Compound (14) at 0???80??? C. for 30 min.???1 day in the presence of SO3.N(C2 H5)3 or SO3 -pyridine and in a medium such as dimethylformamide (DMF) and pyridine.
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