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Dimethyl (2z,3z)-2,3-bis(benzo[1,3]dioxol-5-ylmethylidene)butanedioate

Dimethyl 1,4,5,8-tetrahydronaphthalene-4a,8a-dicarboxylate

Dimethyl 1,4-dioxaspiro[4.5]decane-2,3-dicarboxylate

Dimethyl 1,4-dioxo-2,3,3a,5,6,6a-hexahydropentalene-2,5-dicarboxylate

Dimethyl 2-(1,1-dioxothietan-3-ylidene)propanedioate

Dimethyl 2-(4-ethyl-4-methyl-2-oxo-oxolan-3-ylidene)propanedioate

Dimethyl 2-[[4-[(2-imino-1,3-dimethyl-4-oxo-pteridin-6-yl)methylamino]benzoyl]amino]pentanedioate

Dimethyl 2,2-diphenylpropanedioate

Dimethyl 2,6-dimethyl-4-(1-thiocyanatoethyl)-1,4-dihydropyridine-3,5-dicarboxylate