You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3R,3aR,7aS)-1-cyclopropylsulfonyl-3-(pyridin-2-ylmethoxy)-3,3a,5,6,7,7a-hexahydro-2H-pyrano[3,2-b]pyrrole is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H22N2O4S
assistant