COc1c2c(c(OC)c3c(=O)cc(C/C(=N/NC(=O)C[n+]4ccccc4)C(=O)Nc4cc(C)ccc4C)oc13)OCO2.[Cl-]
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?