#$%^&*AU2020204286A120200716.pdf#####COMPOSITIONS COMPRISING 2-((1-(2(4-FLUOROPHENYL)-2OXOETHYL)PIPERIDIN-4-YL)METHYL)ISOINDOLIN-1-ONE FOR TREATING SCHIZOPHRENIA ABSTRACT The disclosure provides a novel polymorph of Compound (I): 2-((1-(2(4-Fluorophenyl)-2-oxoethyl)piperidin-4-yl)methyl)isoindolin-1-one monohydrochloride dihydrate, i.e., Form (A) of Compound (I)-HO-2H 20. Pharmaceutical compositions comprising Form (A) of Compound (I).HO-2H 20 and related methods of treatment are also disclosed.