They are comprised of a series of derivatives of carbohydrates of a family of biologically active opiated agents, which present in their structure at least one residue of carbohydrate per opiate molecule, linked directly to a hydroxyl group of the opiate or through a C-glycoside bond formed between two functions situated at each of the two constitutive parts of the glycoconjugate. Said derivatives contain more than one carbohydrate residue and/or more than one opiate molecule per carbohydrate residue. The acid salts and the compounds of said opiated glycoconjugates are also included in the disclosed compounds of said invention.