I am trying to do a chart with tikz, I get this
This is the latex script:
\documentclass[12pt,twoside]{report}
%%%<
\usepackage[spanish]{babel}
%interprete de idioma castellano
\usepackage[utf8]{inputenc} %relacionado al input
\usepackage[T1]{fontenc}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}[sibling distance=10em,
every node/.style = {shape=rectangle, rounded corners,
draw, align=center,
top color=white, bottom color=blue!20}]]
\node {Solvatación}
child {{ node {Implícito} }
child{ node {Cosmo} }}
child {{ node {Explícito+Implícito}
child { node {Solvateshell + Cosmo}
child { node {Packmol + Cosmo} } }}};
\end{tikzpicture}
\end{document}
But I need this:



