Ethyl α-{2-[4-(2,4-dioxothiazolidin-5-ylmethyl)phenoxymethyl]-2,5,7,8-tetramethyl-4-oxochroman-6-yloxy}acetate 在
吡啶 、
盐酸羟胺 作用下,
以
甲醇 为溶剂,
生成 ethyl α-{2-[4-(2,4-dioxothiazolidin-5-ylmethyl)phenoxymethyl]-4-hydroxyimino-2,5,7,8-tetramethylchroman-6-yloxy}acetate