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In the title compound, C 12 H 12 N 2 O 3 , the five-membered ring attached to the aromatic ring adopts an envelope conformation with a C atom in the flap position. The spiro-linked five-membered ring adopts a twisted conformation. In the crystal, C—H⋯O hydrogen bonds link the mol­ecules into  C (5) chains propagating in [001].

7′-Methyl-5′-oxo-2′,3′-dihydrospiro[1,3-dioxolane-2,1′(5′H)-indolizine]-6′-carbonitrile