CCC(C)C(NC(=O)OC(C)(C)C)C(=O)Oc1ccc2c(=O)c(-c3ccc([N+](=O)[O-])cc3)coc2c1
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?