| http://www.w3.org/ns/prov#value | - STATE OF THE ARTCommonly assigned U.S. Pat. Nos. 4,254,123; 4,333,934 and to a lesser degree U.S. Pat. Nos. 4,145,419; 4,279,912; 4,151,280; 4,207,318 and 4,291,033 describe tricyclic compounds having antiallergic activity having a different chemicalstructure.OBJECTS OF THE INVENTIONIt is an object of the invention to provide the novel pyrimido-quinoxaline compounds of formula I and their non-toxi
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