Cc1c(CCC(=O)N[C@@H](CC(C)C)C(=O)O)c(=O)oc2cc3oc4c(c3cc12)CCCC4
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?