You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-(3,4,6,7,8,8a-hexahydro-1H-pyrrolo[1,2-a]pyrazin-2-ylmethyl)-1,3-thiazol-2-amine is the IUPAC name of a molecule. Please give its molecular formula.
user
C11H18N4S
assistant