Cn1c(OCc2ccc3c(c2)OCO3)nc2c1c(=O)n(Cc1ccc(Cl)c(Cl)c1)c(=O)n2C
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?