You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (1S,3R,9R,10R)-3-ethyl-12-[(2R)-1-hydroxy-4-methylpentan-2-yl]-15-(2-morpholin-4-ylethyl)-7-propyl-2-oxa-7,12,15-triazatetracyclo[8.8.0.01,13.03,9]octadeca-4,17-diene-8,11,14-trione by IUPAC nomenclature, provide its molecular formula.
user
C31H48N4O6
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