You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule N-[2-[9-[(2-butyl-4-chloro-1H-imidazol-5-yl)methyl]-20-methoxy-18-oxa-3,6,9,14-tetrazatricyclo[17.3.1.02,6]tricosa-1(23),2,4,19,21-pentaen-14-yl]-2-oxoethyl]acetamide into molecular formula.
user
C31H44ClN7O4
assistant