You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1R,2R)-2-[(E)-1-[(4R)-2-amino-4-ethyl-4-ethynyl-6-oxo-5H-pyrimidin-1-yl]-4-methoxybut-2-enyl]-N-[(4S)-6-chloro-2,2-dimethyl-3,4-dihydrochromen-4-yl]cyclopropane-1-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C28H35ClN4O4
assistant