COc1cc2c3cc1Oc1c(OC)c(OC)cc4c1C(=NCC4)Cc1ccc(cc1)Oc1cc(ccc1O)C[C@H]3N(C)CC2
A rotatable bond is defined as any single non-ring bond, attached to a non-terminal, non-hydrogen atom. How many bonds in the molecule are rotatable?