| 摘要 |
A process for preparing the compound of formula (I) by treating the compound of formula (IV) with an aqueous mineral acid. A compound of formula (II) wherein R1 is hydrogen and R2 and R3 together form a single bond or R1 and R2 together form a single bond and R3 is hydrogen or a group of formula (III). The compound of formula (I), its pharmaceutically acceptable salts and prodrugs are useful as hypoglycemic and antiobesity agents. They are also useful in increasing lean meat deposition and/or improving the lean meat to fat ratio in edible animals, i.e. ungulate animals and poultry.
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