发明授权
US5245050A Derivatives of physiologically active substance ML-236B and process for production thereof 失效
生理活性物质ML-236B的衍生物及其生产方法

Derivatives of physiologically active substance ML-236B and process for
production thereof
摘要:
A compound represented by the following general formula: ##STR1## wherein R.sub.1 and R.sub.2 are the same or different, and represent a hydrogen or halogen, and ring-opened free acid, amides and salts thereof are provided. The present invention also provides a process for the production of the above-mentioned compound starting from the known compound ML-236B.
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