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Aroyl-1H-pyrrolo(2,1-c)(1,4)benzoxazine-1,2,4-triones react with substituted 2-(3,3-dimethyl- 8-oxo-2-azaspiro(4.5)deca-6,9-dien-1-ylidene)acetamides to produce substituted 3',4'',5- trioxodispiro((2'',5''-cyclohexadiene)-1''(4'' H),7'-(7 H)pyrrolizine-2'(3' H),2-(2 H)pyrrole) systems. The crystal and molecular structure of substituted 3',4'',5-trioxodispiro((2'',5''-cyclohexadiene)- 1''(4'' H),7'-(7 H)pyrrolizine-2'(3' H),2-(2 H)pyrrole)-1'-carboxamide was confirmed by X-ray analysis.

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Synthesis of dispiro heteroanalogs of pyrrolizidine alkaloids: crystal and molecular structure of substituted 3',4'',5-trioxodispiro[(2'',5''-cyclohexadiene)-1''(4''H),7'-[7H]pyrrolizine-2'(3'H),2-[2H]pyrrole]-1'-carboxamide