Crystal structure of the 1:2 co-crystal between N,N′-bis(4-pyridylmethyl)oxalamide and acetic acid as a dihydrate, C14H14N4O2⋅2 C2H4O2⋅2 H2O - Tan, Sang Loon *; Tiekink, Edward R. T. * (De Gruyter Open, 2019)