3-hydroxy-6H-benzo [C] chromene-6-one derivative and manufacturing method thereof

  • US 9,029,572 B2
  • Filed: 06/13/2014
  • Issued: 05/12/2015
  • Est. Priority Date: 02/09/2011
  • Status: Expired due to Fees
First Claim
Patent Images

1. A compound or a salt thereof, expressed with a formula (IIIa) below

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