Acetic acid 4-(5-acetoxy-7-methoxy-4-oxo-chroman-
Acetic acid 4-(5-acetoxy-7-methoxy-4-oxo-chroman- ??
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Acetic acid 4-(5-acetoxy-7-methoxy-4-oxo-chroman- C??? ??, ??, ??
Acetic acid 4-(5-acetoxy-7-methoxy-4-oxo-chroman- ?? ?? ? ???
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Acetic acid 4-(5-acetoxy-7-methoxy-4-oxo-chroman- ?? ??
???( 0)?? ??