Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
4-Hydroxycoumarin derivatives: 8-substituted 4-hydroxycoumarins 74, 3-aryl-4-hydoxycoumarins 75, 3-arylmethyl-4-hydroxycoumarins 76 and 77, amino group containing 3-hetarylmethyl 4-hydroxycoumarins 78, 3-benzylideneamino-4-hydroxycoumarins 79, 3-aminomethylene-4-hydroxycoumarins 80, bis-(4-hydroxycoumarins) 81, 3-acetyl-4-hydroxycoumarin–Co complex 82, coumarin derivatives with rigid 83 or masked 84 and 85 1,3-dicarbonyl units, and 3-acylcoumarin 86.
