  We present the result of our calculations of ultrafast electron diffraction
(UED) for cyclobutanone excited into $S_2$ electronic state, which are based on
the non-adiabatic dynamics simulations with \textit{Ab Initio} Multiple Cloning
(AIMC) method with the electronic structure calculated at the
SA(3)-CASSCF(12,12)/aug-cc-pVDZ level of theory. The key features in the UED
pattern were identified that can be used to distinguish between the reaction
pathways observed in the AIMC dynamics, although there is a significant overlap
between representative signals due to structural similarity of the products.
The calculated UED pattern can be compared with experiment.
