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1-Azaxanthone derivatives
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Patent number 4,299,963
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Issue date Nov 10, 1981
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Takeda Chemical Industries, Ltd.
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Akira Nohara
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C07 - ORGANIC CHEMISTRY
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1-Azaxanthone derivatives
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Patent number 4,255,576
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Issue date Mar 10, 1981
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Takeda Chemical Industries, Ltd.
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Akira Nohara
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C07 - ORGANIC CHEMISTRY
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Chromone derivatives
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Patent number 4,151,180
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Issue date Apr 24, 1979
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Takeda Chemical Industries, Ltd.
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Akira Nohara
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C07 - ORGANIC CHEMISTRY
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