| 摘要 |
A process for preparing a compound of formula I wherein R<SUP>1 </SUP>is H, C<SUB>1-6</SUB>alkyl, C<SUB>2-6</SUB>alkenyl, C<SUB>1-6</SUB>alkoxy, -OH, or amino; and n, m, and p are independently selected from 0, 1 and 2; which process comprises reacting a compound of formula II, by combining it with a reducing agent in a suitable solvent into a reaction mixture.
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