A Clinical Trial for CTD-ILD Treatment

Inclusion: 1. Subject gives voluntary written informed consent to participate in the study. 2. Subject has been diagnosed with a connective tissue disease and associated interstitial lung disease confirmed by computed tomography of the lungs along with symptoms of cough and/or shortness of breath. 3. Males and females age greater than 18 years at time of screening. 4. Females of childbearing potential must be willing to use a reliable form of medically acceptable contraception and have a negative pregnancy test confirmed at baseline before starting NAC as per standard of care. Women who are surgically sterile or have been post-menopausal for at least two years are not considered to be of child-bearing potential. Exclusion: 1. History of severe chronic kidney disease defined as a glomerular filtration rate of less than 30. 2. Hemoglobin concentration less than 70% of the lower limit of the normal range at time of screening. 3. Moderate to severe hepatic impairment, i.e., Child-Pugh Class B or C.