You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (1S)-2-(cyclobutanecarbonyl)-1-(hydroxymethyl)-7-methoxy-N-propan-2-ylspiro[3,9-dihydro-1H-pyrido[3,4-b]indole-4,3'-azetidine]-1'-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C24H32N4O4
assistant