You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 1-[6,7-dichloro-9-(1,2-dihydropyridin-3-yl)-1,3,4,5-tetrahydropyrido[4,3-b]indol-2-yl]-2-hydroxyethanone .
user
C18H17Cl2N3O2
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