依帕司他杂质2 、
[5-(2-{4-[(3-ethyl-3H-benzoselenazol-2-yliden)-ethylidene]-3-methyl-5-oxo-thiazolidin-2-yliden}-1-ethylmercapto-ethyliden)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid ethyl ester 生成 [5-(2-{4-[(3-ethyl-3
H-benzoselenazol-2-yliden)-ethylidene]-3-methyl-5-oxo-thiazolidin-2-yliden}-1-ethylmercapto-ethylidene)-4,4'-dioxo-2'-thioxo-dihydro-[2,5']bithiazolylidene-3,3'-diyl]-di-acetic acid diethyl ester