Molecule structure STL files are generated by OpenSCAD, of which program is generated by "sdf2scad.perl" Perl script from NCBI PubChem database (3D SDF format files). About generating scripts and note, see http://www.thingiverse.com/thing:689652 (Water and Ethanol). Wintergreen oil (C6H4(OH)(COOH)) is known as medicine for insect bites. When I was high school student, I found it's similar to Aspirin (C6H4(COOCH3)(COOH)) and felt it's mystic. ;-) Construction 3D data (SDF file) is from the PubChem Project https://pubchem.ncbi.nlm.nih.gov/ . See http://www.thingiverse.com/thing:689652 (Water and Ethanol) for detail. I used Microsoft Model Repair Service (https://modelrepair.azurewebsites.net/ , need MS account) for generated STL using OpenSCAD.