You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(1,1-dioxo-2,3,4a,5,6,7,8,8a-octahydrobenzo[b][1,4]thiazin-4-yl)-3-pyrrolidin-3-ylpropan-1-one;hydrochloride is the IUPAC name of a molecule. Please give its molecular formula.
user
C15H27ClN2O3S
assistant