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 2-(2-methyl-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)-4-(4-propan-2-ylphenyl)-1,3-thiazole .
user
C19H22N4S
assistant