You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[2-[(2R,5R)-2-methyl-5-[3-(trifluoromethyl)imidazo[1,2-a]pyrazin-8-yl]oxypiperidine-1-carbonyl]phenyl]ethanesulfinic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H23F3N4O4S
assistant