You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1S,2S,3R)-2-(benzenesulfonyl)-3-(4-chlorophenyl)-1-(ethoxymethyl)cyclopropane-1-carbothioamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H20ClNO3S2
assistant