You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by methyl 2-[[8-carbamoyl-6-[4-(2-hydroxyethoxy)phenyl]-5'-[2-(4-methoxyphenyl)ethynyl]-1,2'-dioxo-3,4-diphenylspiro[4,6,8,8a-tetrahydro-3H-pyrrolo[2,1-c][1,4]oxazine-7,3'-indole]-1'-carbonyl]amino]-3-methylbutanoate ?
user
C51H48N4O10
assistant