You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
butyl 4-[[2-[(2R)-2-[(15R,19S)-16,18-dioxo-17-azapentacyclo[6.6.5.02,7.09,14.015,19]nonadeca-2,4,6,9,11,13-hexaen-17-yl]-4-methylpentanoyl]oxyacetyl]amino]benzoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C37H38N2O7
assistant