[en] Derivative non-linear Schroedinger equation exhibiting non-ultra-local canonical structure is investigated to obtain various relationships including classical r-s matrices and Yang-Baxter relation modified by the non-ultralocality. The complete integrability of the system is established through explicit action-angle canonical variables. An attempt has been made to solve the corresponding quantum field model in the semiclassical approximation. A possibility of eliminating non-ultralocality of the model, necessary for exact quantum inverse scattering treatment, is demonstrated. (author)