Get all unique impropers within a specified molecule. Optionally, can get improper type as well
- molid (int) – Molecule ID to query. Defaults to top molecule
- type (bool) – Whether to include improper type information in the result Defaults to False.
- (list of lists) Information about each improper in the system. Each
improper will be a list with the indices of the four atoms comprising the improper, followed by improper type (as a string) if requested.