Patent ID: 8575376

Claim:
Compounds of general formula (I) where R 1 stands for a group with formula R 3 OOC—R 2 —C(R 4 )—R 5 —, where R 2 stands for alkyl or alkenyl group with 1 to 18 carbon in a straight or a branching carbon chain, which may be substituted by one or more halogen atoms, amino group, which may be either free or protected by a removable protecting group, alkoxycarbonyl group, aromatic group, and/or heterocyclic group, in which the heteroatom means oxygen atom, sulfur, or nitrogen atom; R 3 represents either a hydrogen atom or a protecting group of carboxyl groups; R 4 is selected from a group consisting of oxygen, nitrogen, sulfur and two single bonded hydrogens; and R 5 ; is a bivalent atom selected from a group consisting of oxygen, nitrogen, and carbon; with the proviso that R 1 is not; when R 2 is (CH 2) 0-3 , R 3 is a hydrogen and both R 4 and R 5 are oxygen.