You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 4-(8-chloro-1,3,4,5-tetrahydropyrido[4,3-b]indol-2-yl)-6-methoxypyrimidin-2-amine by IUPAC nomenclature, provide its molecular formula.
user
C16H16ClN5O
assistant