Several reaction steps handling in RDKit

I want to make molecule using several reaction steps. My situation was focused in substituted phenyl ring. Greg who is Developer of RDKit posted great blog post before. http://rdkit.blogspot.jp/2015/01/chemical-reaction-notes-i.html So, I read the post and try to make sample code. My strategy is run reaction and get products as smiles because products of RunReactants need