597507 Disclosed herein is a compound of formula (I0) and salts thereof, wherein the variables are defined in the specification, which has a serotonin 5-HT2c receptor activating action, useful for lower urinary tract conditions, obesity and cancer. Embodiments of the compound include the following: 3-(1-methylethoxy)-6,7,8,9-tetrahydropyrazino[2,3-f][1,4]oxazepine, N-methyl-N-(1-methylethyl)-6,7,8,9-tetrahydropyrazino[2,3-f][1,4]oxazepin-3-amine, and 3-(2-methylpyrrolidin-1-yl)-6,7,8,9-tetrahydropyrazino[2,3-f][1,4]oxazepine.