You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 12-propan-2-ylspiro[21-thia-12-aza-19-azoniahexacyclo[15.3.1.03,8.09,20.011,19.013,18]henicosa-1,3,5,7,9(20),11(19),13(18),14,16-nonaene-10,6'-pyrido[2,1-a]isoindol-5-ium] into its molecular formula.
user
C32H23N3S+2
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