6,7-Dihydro-5H-pyrrolo[3,4-d]pyrimidine hydrochloride is primarily utilized in pharmaceutical research and development. It serves as a key intermediate in the synthesis of various biologically active compounds, particularly those targeting enzyme inhibition. Its structure is often exploited in the design of drugs that interact with protein kinases, making it valuable in the development of treatments for cancer and other diseases involving abnormal cell signaling. Additionally, this compound is explored in medicinal chemistry for its potential in creating novel therapeutic agents with improved efficacy and selectivity.