CCCc1nn(C)c2c(O)nc(-c3cc(S(=O)(=O)N(CCO)CCO)ccc3OCC)nc12
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?