Aluminium oxide

http://classyfire.wishartlab.com/tax_nodes/C0000001
http://classyfire.wishartlab.com/tax_nodes/C0000424
http://classyfire.wishartlab.com/tax_nodes/C0000444
http://classyfire.wishartlab.com/tax_nodes/C0000444
http://classyfire.wishartlab.com/tax_nodes/C0001270
http://classyfire.wishartlab.com/tax_nodes/C0003866
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=9989226
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=347827970
https://www.chemspider.com/Chemical-Structure.8164808.html
https://mor.nlm.nih.gov/RxNav/search?searchBy=RXCUI&searchTerm=615
https://www.ebi.ac.uk/chembldb/index.php/compound/inspect/CHEMBL3707210
https://en.wikipedia.org/wiki/Aluminium_oxide