In the present work we describe the formalization of the closure potential reported in 2019, in which the molecule is represented by RDKit instead of OpenBabel, and rings are perceived with the Hanser-Jauffret-Kaufmann (HJK) ring perception algorithm. HJK returns the complete set of rings, instead of a SSSR, giving us more flexibility in the choice of rings to break and the bonds to remove. This change is part of our ongoing development of an interface between RDKit and AutoDock (Meeko), which enables the user to use RDKit molecules as the input and output for AutoDock calculations, facilitating the integration of docking with other modeling software.