A Novel Spiroheterocyclization: Synthesis of 1-Ethoxycarbonylmethylidene-8- (2′-ethoxycarbonylmethylidene-5′,5′-dimethyl-3′-pyrrolidinylidene) -3,3,6-trimethyl-2-azaspiro[4,5]deca-6,9-diene.

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