(1alpha,5alpha,6alpha)-2-氧杂二环[3.1.0]己-3-烯-3,6-二甲酸 3-乙酯 6-甲酯

(4-Phenyl-furazan-3-yl)-acetic acid methyl ester

4-甲基-戊酸甲酯

叔丁乙酸甲酯

methyl 2-triethylsilylacetate