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 2-[(3aR,6R,7aS)-3a-methoxy-6-pyridin-2-yloxy-3,4,5,6,7,7a-hexahydro-2H-indol-1-yl]-N,N-dimethylacetamide .
user
C18H27N3O3
assistant