You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 1-[2-(1,1-dioxo-1,2-thiazolidin-2-yl)ethyl]-2-methyl-3-(2-methyl-3-thiophen-2-ylpropyl)guanidine by IUPAC nomenclature, provide its molecular formula.
user
C15H26N4O2S2
assistant