A linear molecule is defined recursively:
* An atom
* A linear structure as defined by a meta-atom
* An atom connected to a linear portion
* two linear portions connected together.
Linear atoms are defined in the SQL table MetaAtomInfo with the being . They can be isolated with the command:
Some defined linear meta atoms are:
* Chlorine atom
* Florine atom
* Bromine atom
* Hydrogen atom
* Ethyne group