瑞香素-7-甲醚

7-甲氧基-8-[(3-甲基-2-丁烯-1-基)氧基]-2H-1-苯并吡喃-2-酮

乙酸酐

顺丁烯二酸

7-Hydroxy-2-oxo-2H-chromene-8-carbaldehyde