You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [(1S,2R,5R,7R,8R,9R,11R,13R,14R)-15-acetyl-8-[(2S,3R,4S,6R)-3-acetyloxy-4-(dimethylamino)-6-methyloxan-2-yl]oxy-2-ethyl-1,5,7,9,11,13-hexamethyl-4,6,12-trioxo-16-sulfanylidene-3,17-dioxa-15-azabicyclo[12.3.0]heptadecan-9-yl] 3-cyanopyrrole-1-carboxylate by IUPAC nomenclature, provide its molecular formula.
user
C40H56N4O12S
assistant