Nc1ccn(C2CC(O)C(COP(=O)(S)OC3CC(n4ccc(N)nc4=O)OC3CO)O2)c(=O)n1
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?