4-anilino-3-nitrochromen-2-one

pyrano[3,2-c]chromene-2,5-dione

4-hydroxy-3,6-dinitrochromen-2-one

3-amino-4-hydroxychromen-2-one

6-[5-(2-hydroxyphenyl)-1H-pyrazin-2-ylidene]cyclohexa-2,4-dien-1-one