You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3S,6S,9S,12S,15S,18S)-3-(4-aminobutyl)-15-[(2S)-butan-2-yl]-6-(hydroxymethyl)-9-(1H-imidazol-5-ylmethyl)-12-(1H-indol-3-ylmethyl)-18-(2-methylpropyl)-1,4,7,10,13,16-hexazacyclooctadecane-2,5,8,11,14,17-hexone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C38H56N10O7
assistant