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Condensed purine derivatives
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Patent number 6,306,847
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Issue date Oct 23, 2001
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Kyowa Hakko Kogyo Co., Ltd.
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Hiroshi Tsumuki
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C07 - ORGANIC CHEMISTRY
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Tetracyclic compound
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Patent number 5,646,283
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Issue date Jul 8, 1997
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Kyowa Hakko Kogyo Co., Ltd.
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Fumio Suzuki
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C07 - ORGANIC CHEMISTRY
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Tetracyclic compounds
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Patent number 5,371,225
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Issue date Dec 6, 1994
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Kyowa Hakko Kogyo Co., Ltd.
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Fumio Suzuki
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C07 - ORGANIC CHEMISTRY