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 ethyl (5S)-4,4'-bis(4-methylphenyl)-2'-phenylspiro[1,3,4-thiadiazole-5,1'-phthalazine]-2-carboxylate .
user
C32H28N4O2S
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