Compound of the following formula: wherein X is a covalent bond or a C 1 -C 4 alkyl, Y is a nucleophilic group selected from O, S, NR 4, O-NR 4, NH-O, NH-NR 4, C -O-NR 4, C -NH-O, C -NH-NR 4, O-C -NH-NR 4, NH-C -NH-NR 4, O-C -NH-O, NH-C -NH-O, O-C -O-NR 4, NH-C -O-NR 4, C -S, and R 4 is H or a C 1 -C 4 alkyl group, Z 1, Z 2, Z 3 each represent, independently of one another, N or C, preferably Z 3 represents C, more preferably Z 3 is C and R 3 is in position Z 3, R 1 is H, a C 1 -C 6 alkyl group, an alkenyl, an aryl group, or a heterocycle, said alkyl, alkenyl, aryl or heterocycle groups being optionally substituted by one or more functional groups selected from the following groups: amine, imine, nitrile, cyano, amide, imide, hydroxyl, alkoxyl, carbonyl, carboxyl, ester, thiol, thioether, thioester, and halide, preferably R 1 being a methyl or ethyl group, R 2 is a thermolabile protecting group, that is a protecting group which is stable at room temperature between 15°C and 25°C, and which is cleaved, dissociated, or salted out from a molecule to which it is bonded, by thermal treatment at a temperature comprised between 50 and 100°C; and/or R 2 is an acid-labile protecting group, that is a protecting group which is stable in neutral or basic conditions, and which is cleaved, dissociated, or salted out, in acid conditions at room temperature, by treatment at a pH below 6.0, R 3 is H, a C 1 -C 12 alkyl group, for example an isopropyl, isobutyl, sec-butyl, tert-butyl, isopentyl, or 2,2-dimethylpropyl group, an aryl group, a heterocycle, an acyl group, an alkenyl group, a halogen (for example F, Cl, Br and I), or a cyano group, said alkyl, aryl, heterocycle or alkenyl groups being optionally substituted by one or more functional groups selected from the following groups: amine, imine, nitrile, cyano, amide, imide, hydroxyl, alkoxyl, carbonyl, carboxyl, ester, thiol, thioether, thioester, and halide, and when Y is selected from O, S, and NR 4, X is not a bond. X is a covalent bond or a C 1 -C 4 alkyl, Y is a nucleophilic group selected from O, S, NR 4, O-NR 4, NH-O, NH-NR 4, C -O-NR 4, C -NH-O, C -NH-NR 4, O-C -NH-NR 4, NH-C -NH-NR 4, O-C -NH-O, NH-C -NH-O, O-C -O-NR 4, NH-C -O-NR 4, C -S, and R 4 is H or a C 1 -C 4 alkyl group, Z 1, Z 2, Z 3 each represent, independently of one another, N or C, preferably Z 3 represents C, more preferably Z 3 is C and R 3 is in position Z 3, R 1 is H, a C 1 -C 6 alkyl group, an alkenyl, an aryl group, or a heterocycle, said alkyl, alkenyl, aryl or heterocycle groups being optionally substituted by one or more functional groups selected from the following groups: amine, imine, nitrile, cyano, amide, imide, hydroxyl, alkoxyl, carbonyl, carboxyl, ester, thiol, thioether, thioester, and halide, preferably R 1 being a methyl or ethyl group, R 2 is a thermolabile protecting group, that is a protecting group which is stable at room temperature between 15°C and 25°C, and which is cleaved, dissociated, or salted out from a molecule to which it is bonded, by thermal treatment at a temperature comprised between 50 and 100°C; and/or R 2 is an acid-labile protecting group, that is a protecting group which is stable in neutral or basic conditions, and which is cleaved, dissociated, or salted out, in acid conditions at room temperature, by treatment at a pH below 6.0, R 3 is H, a C 1 -C 12 alkyl group, for example an isopropyl, isobutyl, sec-butyl, tert-butyl, isopentyl, or 2,2-dimethylpropyl group, an aryl group, a heterocycle, an acyl group, an alkenyl group, a halogen (for example F, Cl, Br and I), or a cyano group, said alkyl, aryl, heterocycle or alkenyl groups being optionally substituted by one or more functional groups selected from the following groups: amine, imine, nitrile, cyano, amide, imide, hydroxyl, alkoxyl, carbonyl, carboxyl, ester, thiol, thioether, thioester, and halide, and when Y is selected from O, S, and NR 4, X is not a bond.