You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(4R,9aR)-4-benzhydryl-2-[(2-cyclopropyl-4-methoxy-6-propan-2-yloxypyrimidin-5-yl)methyl]-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-8-yl]-pyrazin-2-ylmethanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C37H43N7O3
assistant