3H-Thiazolo[3,4-a]pyridine-6,8-dicarboxylic acid,3-[2-[(2,5-dioxo-1-pyrrolidinyl)oxy]-2-oxoethyl]-1,7-dihydro-5-methyl-7-(3-nitrophenyl)-, 8-ethyl 6-methyl ester, trans-
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