上游原料
Cyanoacetic acid ethyl ester; Ethyl 2-cyanoacetate; Ethyl cyanoacetate; Ethyl isocyanacetateO-benzylhydroxylamine; 1-[(aminooxy)methyl]benzenecyclopentanone1-(Chloromethyl)benzene; Benzyl chloride2-oxaspiro[4.4]nonane-1,3-dioneethyl 2-cyano-2-cyclopentylideneacetate1-(cyanomethyl)cyclopentanecarbonitrile1-(carboxymethyl)cyclopentanecarboxylic acid2-hydroxy-2-azaspiro[4.4]nonane-1,3-dionesodium 1,3-dioxo-2-azaspiro[4.4]nonan-2-olate
