You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as (1S)-N-(2,4-dichlorophenyl)-1-methyl-3,4-dihydro-1H-pyrrolo[1,2-a]pyrazine-2-carbothioamide using the IUPAC nomenclature.
user
C15H15Cl2N3S
assistant