You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (3R)-4-(imidazo[2,1-b][1,3]thiazol-6-ylmethyl)-3-(1-methylpyrrol-2-yl)morpholine by IUPAC nomenclature, provide its molecular formula.
user
C15H18N4OS
assistant