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 (4S)-5-ethyl-3-(2-hydroxyphenyl)-4-(3-hydroxyphenyl)-1,4-dihydropyrrolo[3,4-c]pyrazol-6-one .
user
C19H17N3O3
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