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 (5R,10bR)-5-(2-bromophenyl)-2-thiophen-2-yl-5,10b-dihydro-1H-pyrazolo[1,5-c][1,3]benzoxazine .
user
C20H15BrN2OS
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