Structures Of The E,Z (Cis-Trans) Isomer Of Diacetamide And The 1-1 Complex With Acetamide At 123 K - Abinitio Molecular-Orbital Calculations On The Z,Z (Trans-Trans), E,Z (Cis-Trans) And E,E (Cis-Cis) Isomers Of Diacetamide