title: N,N'-Dicarb-oxy-N,N'-dicarboxyl-ato(m-phenyl-ene)dimethanaminium monohydrate.
abstract: In the title inner salt, C(16)H(20)N(2)O(8)·H(2)O, two of four carboxyl groups are deprotonated, while the two imine groups are protonated. The two imino-diacetate groups are located on the same side of the benzene ring plane. Extensive inter-molecular O-H⋯O and N-H⋯O hydrogen bonds occur in the crystal.
authors.forename: Yu-Xing
authors.initials: YX
authors.lastname: Qiang
authors.forename: Shou-Rong
authors.initials: SR
authors.lastname: Zhu
authors.forename: Min
authors.initials: M
authors.lastname: Shao