You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S,6R)-2-(2-aminoethyl)-N-[(3S,6S,9S,12S,15R,18S,21S)-6,9-bis(2-aminoethyl)-15-benzyl-18-methyl-3,12-bis(2-methylpropyl)-2,5,8,11,14,17,20-heptaoxo-1,4,7,10,13,16,19-heptazacyclotricos-21-yl]-6-hydroxy-4-oxotridecanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C51H87N11O10
assistant