Cc1cc(N2CCC(C(=O)N3CCN(c4cccc(C)c4C)CC3)CC2)n2ncnc2n1
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?