http://fexxsd5zikgtmwqudztshgod4m54gk2pew3ancgcdblq42gafltai2ad.onion?product=oxycodone
Its chemical name is derived from codeine – the chemical structures are very similar, differing only in that the hydroxyl group of codeine has been oxidized to a carbonyl group (as in ketones), hence the -one suffix, the 7,8-dihydro-feature (codeine has a double-bond between those two carbons), and the hydroxyl group at carbon-14 (codeine has just a hydrogen in its place), hence oxycodone. .