CCCCCCc1cc2c(C)c(C)c(=O)oc2cc1OCCCOc1cc2oc(=O)c(C)c(C)c2cc1CCCCCC
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?