  We prove the optimal endpoint Strichartz estimates for Schr\"{o}dinger
equation with charge transfer potentials and a general source term in
$\mathbb{R}^n$ for $n\geq3$. The proof is based on using the projection on the
scattering states defined implicitly in Rodnianski, Schlag and Soffer
\cite{RSS1}, and asymptotic completeness for such systems. The method works as
well in the matrix non-selfadjoint case.
