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-[1-[[(7S,13S)-21-ethyl-20-[2-[(1S)-1-methoxyethyl]pyridin-3-yl]-17,17-dimethyl-8,14-dioxo-15-oxa-4-thia-9,21,27,28-tetrazapentacyclo[17.5.2.12,5.19,13.022,26]octacosa-1(25),2,5(28),19,22(26),23-hexaen-7-yl]amino]-3-methyl-1-oxobutan-2-yl]-N-methyl-2-prop-2-enoyl-2,7-diazaspiro[3.5]nonane-7-carboxamide into molecular formula.
user
C51H67N9O7S
assistant