Azolo compound wherein R is selected from the group consisting of H, D, CN, NHR 5, NDR 5, Cl, OR 3, SR 3 and C 1-4 -alkyl, in particular H, D, methyl; X is N or CR 1, wherein the nitrogen or carbon atom is an aromatic atom; W is selected from the group consisting of a covalent bond, CR 4, wherein the carbon atom is an aromatic ring atom, CH 2, S, O, N, wherein the nitrogen atom is an aromatic ring atom, NH and NR 2; X 1 is selected from the group consisting of a covalent bond, CR 4, wherein the carbon atom is an aromatic ring atom, CH 2, S, O, N, wherein the nitrogen atom is an aromatic ring atom, NH and NR 2; Y is selected from the group consisting of a covalent bond, CR 4, wherein the carbon atom is an aromatic ring atom, CH 2, S, O, N, wherein the nitrogen atom is an aromatic ring atom, NH and NR 2; Z is selected from the group consisting of a covalent bond, CR 4, wherein the carbon atom is an aromatic ring atom, CH 2, S, O, N, wherein the nitrogen atom is an aromatic ring atom, NH and NR 2; wherein denotes a single bond or a double bond; wherein W, X 1, Y and Z are members of the same ring and are selected such that the ring consists of five or six members; W, X 1, Y and Z are selected such that the ring does not comprise more than two nitrogen atoms in the ring, and W, X 1, Y and Z are selected such that the ring does not comprise an acetal, thioacetal, aminal or hydrazine group; wherein the compound does not comprise a peroxide or disulfide group; and wherein R 1 is selected from the group consisting of H, D, CD 3, CHD 2, CH 2 D, CF 3, CHF 2, CH 2 F, CDF 2, CD 2 F, C 1-4 -alkyl, optionally substituted with OH, halogen, OR 3; R 2 is selected from the group consisting of CHO, COCH 3, COC 2 H 5, COC 3 H 7, COCH(CH 3) 2, COC 4 H 9, COC(CH 3) 3; R 3 is selected from the group consisting of C 1-4 -alkyl; R 4 is selected from the group consisting of H, D, F, Cl, methyl, CH 2 F, CHF 2, CF 3, OCH 3, OCD 3; and R 5 is C 1-4 -alkyl, optionally substituted with OH, for use in a method of treatment or prevention of fibrosis. R is selected from the group consisting of H, D, CN, NHR 5, NDR 5, Cl, OR 3, SR 3 and C 1-4 -alkyl, in particular H, D, methyl; X is N or CR 1, wherein the nitrogen or carbon atom is an aromatic atom; W is selected from the group consisting of a covalent bond, CR 4, wherein the carbon atom is an aromatic ring atom, CH 2, S, O, N, wherein the nitrogen atom is an aromatic ring atom, NH and NR 2; X 1 is selected from the group consisting of a covalent bond, CR 4, wherein the carbon atom is an aromatic ring atom, CH 2, S, O, N, wherein the nitrogen atom is an aromatic ring atom, NH and NR 2; Y is selected from the group consisting of a covalent bond, CR 4, wherein the carbon atom is an aromatic ring atom, CH 2, S, O, N, wherein the nitrogen atom is an aromatic ring atom, NH and NR 2; Z is selected from the group consisting of a covalent bond, CR 4, wherein the carbon atom is an aromatic ring atom, CH 2, S, O, N, wherein the nitrogen atom is an aromatic ring atom, NH and NR 2; wherein denotes a single bond or a double bond; wherein W, X 1, Y and Z are members of the same ring and are selected such that the ring consists of five or six members; W, X 1, Y and Z are selected such that the ring does not comprise more than two nitrogen atoms in the ring, and W, X 1, Y and Z are selected such that the ring does not comprise an acetal, thioacetal, aminal or hydrazine group; wherein the compound does not comprise a peroxide or disulfide group; and wherein R 1 is selected from the group consisting of H, D, CD 3, CHD 2, CH 2 D, CF 3, CHF 2, CH 2 F, CDF 2, CD 2 F, C 1-4 -alkyl, optionally substituted with OH, halogen, OR 3; R 2 is selected from the group consisting of CHO, COCH 3, COC 2 H 5, COC 3 H 7, COCH(CH 3) 2, COC 4 H 9, COC(CH 3) 3; R 3 is selected from the group consisting of C 1-4 -alkyl; R 4 is selected from the group consisting of H, D, F, Cl, methyl, CH 2 F, CHF 2, CF 3, OCH 3, OCD 3; and R 5 is C 1-4 -alkyl, optionally substituted with OH, wherein denotes a single bond or a double bond; wherein W, X 1, Y and Z are members of the same ring and are selected such that the ring consists of five or six members; W, X 1, Y and Z are selected such that the ring does not comprise more than two nitrogen atoms in the ring, and W, X 1, Y and Z are selected such that the ring does not comprise an acetal, thioacetal, aminal or hydrazine group; wherein the compound does not comprise a peroxide or disulfide group; and wherein R 1 is selected from the group consisting of H, D, CD 3, CHD 2, CH 2 D, CF 3, CHF 2, CH 2 F, CDF 2, CD 2 F, C 1-4 -alkyl, optionally substituted with OH, halogen, OR 3; R 2 is selected from the group consisting of CHO, COCH 3, COC 2 H 5, COC 3 H 7, COCH(CH 3) 2, COC 4 H 9, COC(CH 3) 3; R 3 is selected from the group consisting of C 1-4 -alkyl; R 4 is selected from the group consisting of H, D, F, Cl, methyl, CH 2 F, CHF 2, CF 3, OCH 3, OCD 3; and R 5 is C 1-4 -alkyl, optionally substituted with OH, R 1 is selected from the group consisting of H, D, CD 3, CHD 2, CH 2 D, CF 3, CHF 2, CH 2 F, CDF 2, CD 2 F, C 1-4 -alkyl, optionally substituted with OH, halogen, OR 3; R 2 is selected from the group consisting of CHO, COCH 3, COC 2 H 5, COC 3 H 7, COCH(CH 3) 2, COC 4 H 9, COC(CH 3) 3; R 3 is selected from the group consisting of C 1-4 -alkyl; R 4 is selected from the group consisting of H, D, F, Cl, methyl, CH 2 F, CHF 2, CF 3, OCH 3, OCD 3; and R 5 is C 1-4 -alkyl, optionally substituted with OH,