You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule [(3aR,6S,7aS)-6-hydroxy-3a-methoxy-3,4,5,6,7,7a-hexahydro-2H-indol-1-yl]-(2-methyl-5-phenylpyrazol-3-yl)methanone ?
user
C20H25N3O3
assistant