#$%^&*AU2017213570A120170831.pdf#####11 rbr Interwoven NRPortbl DCC RBR 15506000 i.docx- I /08/2017 ABSTRACT Provided is a solution suitable for oral administration of 7-[ 4-(4-benzo[ b] thiophen-4-yl-piperazin-1-yl)butoxy]-1H5 quinolin-2-one(compound (I)) or a salt thereof. A solution for oral administration containing compound (I) or a salt thereof, and at least one compound selected from the group consisting of lactic acid, phosphoric acid, glycolic acid, malic acid, tartaric acid, citric acid, succinic acid and acetic acid and 10 having pH 2.5 - 4.5.