9-methoxy-4-(pyridin-2-ylmethylideneamino)furo[3,2-g]chromen-7-one

9-methoxy-4-(pyridin-4-ylmethylideneamino)furo[3,2-g]chromen-7-one

9-methoxy-4-[(4-nitrophenyl)methylideneamino]furo[3,2-g]chromen-7-one

4-[[(Z)-indol-3-ylidenemethyl]amino]-9-methoxyfuro[3,2-g]chromen-7-one