You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 9-ethyl-N-[4-(2-hydroxyethylamino)-4-oxobutyl]-N-methyl-6-(oxan-4-yl)-5,6,7,8-tetrahydrocarbazole-3-carboxamide .
user
C27H39N3O4
assistant