N=c1ccn2c(n1)O[C@H]1[C@@H](OP(=O)(O)O)[C@H](CO)O[C@H]12
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?