You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 7-chloro-5-(2-chlorophenyl)-3-hydroxy-1-(pyrrolidin-1-ylmethyl)-3H-1,4-benzodiazepin-2-one .
user
C20H19Cl2N3O2
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