Cysteine, N-acetylcysteine, and penicillamine related compounds, pharmaceutical compositions comprising the cysteine, N-acetylcysteine, and penicillamine related compounds, and methods of using cysteine, N-acetylcysteine, and penicillamine related compounds and pharmaceutical compositions thereof for treating liver, kidney, lung, neurological, inflammatory, and autoimmune disorders including paracetamol overdose, non-alcoholic steatohepatitis, Wilson's disease, cystinuria, irritable bowel disorder, ulcerative colitis, rheumatoid arthritis, chronic obstructive pulmonary disease, interstitial lung disease, asthma, cystic fibrosis, Parkinson's disease, and Huntington's disease.

Provided is a method for producing an organic compound, the method making it possible to ensure an adequate reaction time and obtain a targeted substance at a high yield even in an organic reaction that requires a relatively long time to complete the reaction. A method for producing an organic compound, wherein the method is characterized in that: a fluid processing apparatus F used in the production method is equipped with an upstream processing unit that processes a fluid to be processed between at least two processing surfaces 1 and 2 that relatively rotate, and a downstream processing unit disposed downstream of the upstream processing unit, the downstream processing unit being provided with a plurality of labyrinth seals that function to retain and stir the fluid to be processed that has been processed by the upstream processing unit; due to the fluid to be processed, which contains at least one type of organic compound, being passed through the upstream processing unit, the fluid to be processed is subjected to upstream processing; due to the fluid to be processed that has been subjected to upstream processing being passed through the downstream processing unit, the fluid to be processed that has been subjected to upstream processing is subjected to downstream processing; and the upstream processing and the downstream processing are performed continuously.