You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl (2Z)-2-[(1S,3S,5S,7R,9R,13R,15S,17E,18S,19S,21E,26Z,28R)-5,18-diacetyloxy-9,19-dihydroxy-13-[(1R)-1-hydroxyethyl]-3-methoxy-17-(2-methoxy-2-oxoethylidene)-4,4,20,20-tetramethyl-11-oxo-12,32,33,34-tetraoxatetracyclo[26.3.1.13,7.115,19]tetratriaconta-21,26-dien-30-ylidene]acetate is the IUPAC name of a molecule. Please give its molecular formula.
user
C47H70O17
assistant