You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S,3R)-N-(4-aminocyclohexyl)-4-cyclopropyl-5-oxo-3-pyridin-3-ylmorpholine-2-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H26N4O3
assistant