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Pyrimido(4,5-c)pyridazines
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Patent number 4,323,679
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Issue date Apr 6, 1982
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Burroughs Wellcome Co.
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Robert W. Morrison
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C07 - ORGANIC CHEMISTRY
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Pyrido derivatives
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Patent number 4,288,365
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Issue date Sep 8, 1981
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Burroughs Wellcome Co.
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Robert W. Morrison
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C07 - ORGANIC CHEMISTRY
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Pyrimido(4,5-c)pyridazines
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Patent number 4,225,710
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Issue date Sep 30, 1980
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Burroughs Wellcome Co.
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Robert W. Morrison
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C07 - ORGANIC CHEMISTRY