5-methoxy-2,2-dimethyl-10-phenyl-2,3-dihydro-pyrano[2,3-f]chromene-4,8-dione
5-methoxy-2,2-dimethyl-10-phenyl-2,3-dihydro-pyrano[2,3-f]chromene-4,8-dione-4-(2,4-dinitro-phenylhydrazone)
5-methoxy-2,2-dimethyl-10-phenyl-2,3-dihydro-pyrano[2,3-f]chromene-4,8-dione-4-semicarbazone