You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (2R,3aS,7aS)-N-methyl-6-(1-methylimidazol-4-yl)sulfonyl-N-(pyridin-2-ylmethyl)-3,3a,4,5,7,7a-hexahydro-2H-furo[2,3-c]pyridine-2-carboxamide .
user
C19H25N5O4S
assistant