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In the title compound, C15H15NO4, the quinoline ring system and one of the malonate side chains are essentially coplanar (r.m.s. deviation = 0.0297 Å). The two malonate C—C(=O)—O—CH3 side chains are oriented at right angles [89.68 (8)°] with respect to each other. The crystal packing is stabilized by weak non-classical inter­molecular C—H...O hydrogen bonds, which link the mol­ecules into dimers about inversion centers.

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In the title compound, C15H20O7, the benzene ring makes dihedral angles of 69.17 (5) and 80.81 (4)° with the two side chains of malonate. The two malonate side chains comprising C/C/O/C atoms are oriented at right angles [86.26 (6)°] with respect to each other. In the crystal structure, the crystal packing is stabilized by weak non-classical inter­molecular C—H...O hydrogen bonds, which link the mol­ecules into an infinite network.
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