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 [5-[[3-(2,3-dimethylbutoxy)-2,2-dimethylpropoxy]methyl]-3,5-dimethylheptan-3-yl]-hydroxy-oxophosphanium ?
user
C21H44O4P+
assistant