4-methyl-2-(2-oxochromen-3-yl)chromeno[3,4-c]pyridin-5-one

11-methyl-9-(2-oxo-2H-1-benzopyran-3-yl)-8-oxa-10-azatricyclo[7.3.1.02,7]trideca-2,4,6,11-tetraene-12-carboxylic acid

9-(3-coumarinyl)-12-(2-hydroxyethylidene)-8-oxa-10-azatricyclo<7.3.1.02.7>trideca-2,4,6-trien-11-one

(6Z)-6-[(butan-2-ylamino)methylidene]cyclohexa-2,4-dien-1-one

2-(methoxymethoxy)benzaldehyde