about c4d.CallButton()

[Delizade]

Hi,
I need to run "Node Editor" Button action on the Basic tab of an Octane Material by python script.
If I manually click that button Script Log shows this line: c4d.CallButton(material(), c4d.OCT_MATERIAL_NODE_EDITOR)
I couldn't figure out what is material() function and obviously my script can't find where it is.

could anyone know what is it or which module includes this function?

thank you