title: 4-[(Dieth-oxy-phosphino-yl)meth-yl]benzoic acid.
abstract: In the title compound, C(12)H(17)N(2)O(5)P, the phospho-nate group is almost orthogonal to both the ethyl groups, with a dihedral angle of 83.75 (11)°. In the crystal, mol-ecules are linked into centrosymmetric dimers via pairs of O-H⋯O hydrogen bonds with an R(2) (2)(20) graph-set motif. The crystal structure is further consolidated by weak C-H⋯π inter-actions.
authors.forename: S
authors.initials: S
authors.lastname: Karthikeyan
authors.forename: K
authors.initials: K
authors.lastname: Sethusankar
authors.forename: Ganesan Gobi
authors.initials: GG
authors.lastname: Rajeshwaran
authors.forename: Arasambattu K
authors.initials: AK
authors.lastname: Mohanakrishnan