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 5a-hydroxy-9a-(5-hydroxy-2-methylphenyl)-6-methyl-2-oxo-7-(2-phenylethyl)-1,5,6,8,9,10-hexahydropyrido[3,4-g]quinoline-3-carboxamide;ethane .
user
C31H39N3O4
assistant