You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (4R)-2-amino-4-(3,5-dichloro-4-ethoxyphenyl)-5-oxo-4,6,7,8-tetrahydrochromene-3-carbonitrile ?
user
C18H16Cl2N2O3
assistant