You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[3-(3-aminopropanoyloxy)-4,5-dihydroxy-6-(2-hydroxy-3-octadecanoyloxypropoxy)oxan-2-yl]methanesulfonic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C30H57NO12S
assistant