Patents Assigned to Otsuka Kagaku Yakuhim Kabushiki Kaisha
  • 2-Cyclopentenone derivatives
    Patent number: 4163111
    Abstract: A 2-cyclopentenone derivative represented by the formula ##STR1## wherein R.sub.1 and R.sub.2 are lower straight-chain or branched-chain alkyl, alkenyl or aralkyl, and R.sub.4 is 2-pentenyl or 2-pentynyl, and process for preparing the same.
    Type: Grant
    Filed: June 8, 1978
    Date of Patent: July 31, 1979
    Assignee: Otsuka Kagaku Yakuhim Kabushiki Kaisha
    Inventors: Sigeru Torii, Hideo Tanaka, Yuichi Kobayashi