having the hetero atoms in positions 1 and 3

Patents Grantslast 30 patents

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    3883510

    • Patent number 3,883,510
    • Issue date May 13, 1975
    • C07 - ORGANIC CHEMISTRY
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    3790566

    • Patent number 3,790,566
    • Issue date Feb 5, 1974
    • C07 - ORGANIC CHEMISTRY
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    3775409

    • Patent number 3,775,409
    • Issue date Nov 27, 1973
    • C07 - ORGANIC CHEMISTRY