Cc1cccc(C)c1OCc1nc2c3c(-c4ccccc4)c(-c4ccccc4)oc3ncn2n1
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?