This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Terephthalicacidchemicalsynthesis. en May created the image myself with chemical drawing program and converted it to en Choij CommonsHelper Stone en Stone Original upload log page en Terephthalicacidchemicalsynthesis Stone bytes no created the image myself with chemical drawing program and converted it to ParaXylene