COCc1nc2c(OC)c(-c3nc4ccc(N5CCN(C)CC5)cc4[nH]3)cc(OC)c2[nH]1
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?