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Quinine derivatines
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Patent number 4,818,441
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Issue date Apr 4, 1989
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Takeda Chemical Industries, Ltd.
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Isuke Imada
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C07 - ORGANIC CHEMISTRY
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Spirobenzofuranone compounds
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Patent number 4,330,554
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Issue date May 18, 1982
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Takeda Chemical Industries, Ltd.
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Hirosada Sugihara
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C07 - ORGANIC CHEMISTRY
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Spirobenzofuranone compounds
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Patent number 4,284,644
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Issue date Aug 18, 1981
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Takeda Chemical Industries, Ltd.
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Hirosada Sugihara
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C07 - ORGANIC CHEMISTRY
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