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 identified by 4-[(8aS)-7-[[(4S)-4-[(2-bromo-4-fluorophenyl)methyl]-5-methoxycarbonyl-2-(1,3-thiazol-2-yl)-1,4-dihydropyrimidin-6-yl]methyl]-3-oxo-5,6,8,8a-tetrahydro-1H-imidazo[1,5-a]pyrazin-2-yl]-3-fluorobenzoic acid ?
user
C30H27BrF2N6O5S
assistant