You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule 3-methyl-6-(3-methylbutylamino)-5-[(4-methyl-1,3-thiazol-2-yl)methylideneamino]-1H-pyrimidine-2,4-dione ?
user
C15H21N5O2S
assistant