4-methoxy-1-oxaspiro[5.5]undec-3-en-2-one

2-methylbutan-2-yl 3-oxobutanoate

去氢乙酸

3,9-diacetyl-4,5,10-trimethylpyrano[2,3-h]chromene-2,8-dione

2(1H)-喹喔啉酮 4-氧化物