The present invention relates to substituted aromatic compounds for use in prevention or treatment of various fibrotic diseases and conditions in subjects, including pulmonary fibrosis, liver fibrosis, skin fibrosis and cardiac fibrosis, where the compound has the following formula: or a pharmaceutically acceptable salt thereof, wherein A is C5 alkyl, C6 alkyl, C5 alkenyl, C6 alkenyl, C(O)-(CH2)n-CH3 or CH(OH)-(CH2)n-CH3 wherein n is 3 or 4; R1 is H, OH or F; R2 is H, OH, F or CH2-OH; R3 is H, OH, F or CH2Ph; R4 is H, OH or F; Q is 1) (CH2)mC(O)OH wherein m is 1 or 2, 2) CH(CH3)C(O)OH, 3) C(CH3)2C(O)OH, 4) CH(F)-C(O)OH, 5) CF2-C(O)OH, or 6) C(O)-C(O)OH.本發明係關於用於預防或治療個體之各種纖維變性疾病及病狀,包括肺纖維化、肝纖維化、皮膚纖維化及心臟纖維化的經取代之芳族化合物,其中該化合物具有下式:或其醫藥學上可接受之鹽,其中A為C5烷基、C6烷基、C5烯基、C6烯基、C(O)-(CH2)n-CH3或CH(OH)-(CH2)n-CH3,其中n為3或4;R1為H、OH或F;R2為H、OH、F或CH2-OH;R3為H、OH、F或CH2Ph;R4為H、OH或F;Q為1)(CH2)mC(O)OH,其中m為1或2,2)CH(CH3)C(O)OH,3)C(CH3)2C(O)OH,4)CH(F)-C(O)OH,5)CF2-C(O)OH,或6)C(O)-C(O)OH。