Cc1ccc(NC(=O)c2c(C)oc3ccc(O)c(CN(C)Cc4ccccc4)c23)c(C)c1
A rotatable bond is defined as any single non-ring bond, attached to a non-terminal, non-hydrogen atom. Amide C-N bonds are not counted because of their high barrier to rotation.  How many rotatable bonds does the molecule have?