| http://www.w3.org/ns/prov#value | - Hence the polyethylene glycol substituted by thiol groups or/and disulfide groups preferably has the following general structural formula: ##STR1## in which the residue R1 as well as at least one of the residues R2 and R3 is an organic residue which contains at least 2 and preferably at least 3 (CH2 --CH2 --O) groups.
|
