(3-Phenyloxetan-3-yl)methanamine Hydrochloride is a salt analog of (3-Phenyloxetan-3-yl)methanamine (CAS# 497239-45-9), which can be useful in cyclodimerization of small cyclic ethers via neighboring carbonyl-group participation and cation transfer. It may also be useful in the synthesis and screening of MASP-2 inhibitors, for use in drug development and treatment of MASP-2-associated diseases.