You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name tert-butyl 2-[(11R)-6-(2,6-dimethylphenyl)-7-ethyl-11-(2-methylpropyl)-13-oxo-9-oxa-2-thia-3,5,12,19-tetrazatricyclo[12.3.1.14,8]nonadeca-1(17),4,6,8(19),14(18),15-hexaen-12-yl]-7-azaspiro[3.5]nonane-7-carboxylate ?
user
C40H53N5O4S
assistant