Element

MolSysMT defines an orthogonal hierarchy of structural element tiers to represent molecular topologies at multiple levels of granularity—from individual atoms to macromolecular chains and distinct chemical entities.

Is element	Validating recognized topological element tiers
Is composed of	Checking structural containment relationships
Atom	Operations for individual atom entities
Group	Operations for residue and functional group entities
Component	Operations for covalently connected polymer components
Molecule	Operations for distinct chemical molecules
Entity	Operations for molecular species and entity definitions
Chain	Operations for structural chains and macromolecular strands