... mass 205 (MS) 3-Phenyl-4-furoxancarboxamide (13): The ester 10 (2.00 g, 9.10 mmol) was heated for 16 h at 130°C. The mixture of the esters 10/ 11 so obtained was ammonolyzed as reported above for the prep- aration of 12. ... Liebigs Ann. Chem. 1990, 335-338 Page 4. 338 ...