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OXYGEN-CONTAINING FUSED RING DERIVATIVE AND ORGANIC ELECTROLUMINESCENCE DEVICE COMPRISING THE SAME

  • US 20130306958A1
  • Filed: 11/22/2011
  • Published: 11/21/2013
  • Est. Priority Date: 11/22/2010
  • Status: Active Grant
First Claim
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1. An oxygen-comprising fused ring of formula (1):

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