Can any one answer about any website for downloading chemical structures of bioactive compounds ?

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Piotr Minkiewicz

The above structures are annotated in databases (PubChem, FooDB or others).

Links to these and other database homepages may be found at the following websites:

https://biochemia.uwm.edu.pl/metachemibio/miscellaneous-compounds/

https://biochemia.uwm.edu.pl/metachemibio/food-components/

Structures may be drawn using molecule editors. Editor MarvinJS at FooDB website has a nice graphics. Structure annotated in SMILES code may be displayed using this program.

I would like add something:

Reviews about databases mentioned in previous answer are available below:

https://www.researchgate.net/publication/311449909_Internet_Databases_of_the_Properties_Enzymatic_Reactions_and_Metabolism_of_Small_Molecules-Search_Options_and_Applications_in_Food_Science

https://www.researchgate.net/publication/331285562_Free_Accessible_Databases_as_a_Source_of_Information_about_Food_Components_and_Other_Compounds_with_Anticancer_Activity-Brief_Review