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Chemical compounds

  • US 4,470,981 A
  • Filed: 12/20/1982
  • Issued: 09/11/1984
  • Est. Priority Date: 12/20/1982
  • Status: Expired due to Term
First Claim
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1. A compound of formula I ##STR6## where R1 represents hydrogen, lower alkanoyl or aryol, or tri-lower alkyl silyl, or a group R3 --O--CO-- (where R3 represents lower alkyl);

  • R2 represents hydrogen, hydroxyl or fluorine and X repreesents --S--;

    --SO--, --SO2 --, --O-- or --NR4 -- (where R4 represents hydrogen, lower alkyl or lower alkanoyl).

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