COc1ccc2nc(O)c(C(c3nnnn3C(C)(C)C)N(Cc3ccco3)CC3CCCO3)cc2c1
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?