THEORETICAL MODEL OF THE DIISOPROPYLPHOSPHORYL- ACETYLCHOLINESTERASE COMPLEXED WITH 1,7-HEPTYLENE-BIS-N,N'- SYN-2-PYRIDINIUMALDOXIMETHEORETICAL MODEL OF THE DIISOPROPYLPHOSPHORYL- ACETYLCHOLINESTERASE COMPLEXED WITH 1,7-HEPTYLENE-BIS-N,N'- SYN-2-PYRIDINIUMALDOXIME