You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[[(1S,3R,5R,6S,8R,10R,11S,13R,15R,16S,18R,20R,21S,23R,25R,26S,28R,30R,31R,32R,33R,34R,35R,36R,37R,38R,39R,40R,41R,42R)-33-ethoxy-32,34,35,36,37,38,39,40,41,42-decahydroxy-5,10,15,20,25,30-hexakis(hydroxymethyl)-2,4,7,9,12,14,17,19,22,24,27,29-dodecaoxaheptacyclo[26.2.2.23,6.28,11.213,16.218,21.223,26]dotetracontan-31-yl]oxy]butane-1-sulfonic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C42H72O33S
assistant