L-Leucyl-4-methoxy-b-napthylamide - hydrochloride monohydrate is a chemical compound with CAS number 103476-89-7 and a molecular weight of 364.88 g/mol.
 
It is a white crystalline powder with potential hazards including eye and skin irritation, respiratory irritation, and ingestion toxicity. 
 
The substance is commonly used in research and biochemical applications, particularly in the study of protease enzymes. Its appearance is white to off-white powder, and caution should be taken when handling or storing the substance.
 
Detailed information on safety handling and disposal can be found in the MSDS documentation.