You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(Z)-but-2-enedioic acid;3-[2-[4-(6-fluoro-1,2-benzoxazol-3-yl)piperidin-1-yl]ethyl]-2-methyl-6,7,8,9-tetrahydropyrido[1,2-a]pyrimidin-4-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H31FN4O6
assistant