CCc1cc(=O)oc2c(C)c(OCC(=O)N3CC[C@@]4(O)CCCC[C@H]4C3)ccc12
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?