Abstract Background Chemical compounds affecting a bioactivity can usually be classified into several groups. each of which shares a characteristic substructure. We call these substructures "basic active structures" or BASs. The extraction of BASs is challenging when the database of compounds contains a variety of skeletons. https://safeersappliancers.shop/product-category/zanussi-zcv46250ba-electric-cooker-ceramic-hob-black-a-a-rated-55cm/