Back to results
US 3,937,719 AGranted
(4-Oxo-4H-1-benzopyran-2-yl)-oxamic acid, salts and esters anti-allergic agents
AssigneeAmerican Home Products Corporation
InventorsJohn H. Sellstedt, Dieter H. Klaubert
Life of this patent
Estimating the term…
Abstract
Anti-allergic agents present the following structural formula: ##SPC1## In which R is --H, lower alkyl or an alkali metal cation. R.sup.2 is alkyl of 1 to 6 carbon atoms or hydroxyalkyl of 2 to 6 carbon atoms.
Claims5
A compound of the formula ##SPC3##
- in which
- R is --H, alkyl of 1 to 6 carbon atoms or an alkali metal cation and
- R.sup.2 is alkyl of 1 to 6 carbon atoms or hydroxyalkyl of 2 to 6 carbon atoms.
Dependencies are inferred from the claim text.