You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[5-(dimethylsulfamoyl)-4,6,7,8-tetrahydropyrazolo[1,5-a][1,4]diazepin-2-yl]propanoic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C12H20N4O4S
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