You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (3S,8aR)-2-[2-[(1S)-1-amino-2-methylpropyl]-1,3-thiazole-4-carbonyl]-3-methyl-1,3,6,7,8,8a-hexahydropyrrolo[1,2-a]pyrazin-4-one .
user
C16H24N4O2S
assistant