3,4-dihydroxynaphthalene-1-sulfonic acid

乙酸1,4-二氧代-1,4-二氢萘-2-基酯

3,4-dichloronaphthalene-1,2-diol

ethyl 2-oxobenzo[h]chromene-4-carboxylate

ethyl 2-(2-oxobenzo[g][1]benzofuran-3-ylidene)acetate