ethyl 1-acetoxy-3-ethyl-6,8,9-trimethoxyanthracene-2-carboxylate

1-Acetoxy-3-ethyl-6,8-dimethoxy-9,10-dioxo-9,10-dihydro-anthracene-2-carboxylic acid ethyl ester

2-戊炔酸甲酯

methyl 3-ethyl-1,6,8-trimethoxy-9,10-dioxoanthracene-2-carboxylate

methyl 2-dimethoxymethylene-3-methylenepentanoate