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Two-photon upconverting dyes and applications

  • US 5,912,257 A
  • Filed: 09/05/1996
  • Issued: 06/15/1999
  • Est. Priority Date: 09/06/1995
  • Status: Expired due to Fees
First Claim
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1. A compound having the formula:

  • ##STR29## wherein R2 is unsubstituted alkyl,R1 and R3 are selected from the group consisting of hydroxyalkyl, sulfoalkyl, and carboxyalkyl,A and B are hydrogen, andY is a counterion.

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