You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (3S,7aR)-3-(4-methoxyphenyl)-6-(3-methylphenyl)-3,7a-dihydro-1H-imidazo[1,5-c][1,3]thiazole-5,7-dione ?
user
C19H18N2O3S
assistant