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The asymmetric unit of the title compound, C 12 H 8 O 4 ·2C 5 H 9 NO, contains one half-mol­ecule of naphthalene-2,6-dicarb­oxy­lic acid (NDA) and one mol­ecule of 1-methyl­pyrrolidin-2-one (NMP): the NDA molecules lie on the crystallographic twofold rotation axes. In the crystal, the components are linked by strong O—H⋯O hydrogen bonds and C—H⋯O inter­actions.

Naphthalene-2,6-dicarboxylic acid–1-methylpyrrolidin-2-one (1/2)