title: Naphthalene-2,6-dicarb-oxy-lic acid-1-methyl-pyrrolidin-2-one (1/2).
abstract: The asymmetric unit of the title compound, C(12)H(8)O(4)·2C(5)H(9)NO, contains one half-mol-ecule of naphthalene-2,6-dicarb-oxy-lic acid (NDA) and one mol-ecule of 1-methyl-pyrrolidin-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 inter-actions.
authors.forename: Bianhua
authors.initials: B
authors.lastname: Wu
authors.forename: Ge
authors.initials: G
authors.lastname: Peng
authors.forename: Youwei
authors.initials: Y
authors.lastname: Cheng
authors.forename: Xi
authors.initials: X
authors.lastname: Li
authors.forename: Jiyong
authors.initials: J
authors.lastname: Liu