2-methyl-3,4-dihydro-2H-benzo[c]azepine-1,5-dione

3'-ethoxy-2-methyl-3,4-dihydro-2H-spiro[benzo[c]azepine-5,2'-oxetan]-1-one

2-氧代乙烷磺酸

乙缩醛

1-butoxy-1-ethoxyethane