2,2-dimethyl-3,4-dihydropyrano[3,2-c]chromen-5-one

methyl 2,2-dimethylchromene-6-carboxylate

2-bromo-3-methylbut-2-enal

1,1-dimethoxy-3-methylbut-2-ene

3-巯基-3-甲基-1-丁醇