Aerilius has developed molecule importer.
This sketchup extension is compatible with SketchUp 6, SketchUp 7, SketchUp 8, SketchUp 2013, SketchUp 2014, SketchUp 2015, SketchUp 2016, SketchUp 2017.
The users can utilize this sketchup extension, to transmit molecule models into sketchup in .mol and z-matrix formats. These molecule models can be improved with the drawing tools of sketchup.
These molecular models can be generated in chemical drawing programs like ACD ChemSketch. This extension also arranges an “examples” folder to start functioning.
The scale of the imported models is not a physical scale, but it relies on the drawing scale that is described in the .mol file.
Choose File → Import then opt for the MDL Molfile format.
Download the this sketchup extension from extension warehouse extensions.sketchup.com