You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name cesium;[4-[(E)-2-(15-methyl-3-thia-15-azahexacyclo[11.11.0.02,10.04,9.014,22.016,21]tetracosa-1(13),2(10),4,6,8,11,14(22),16(21),17,19,23-undecaen-18-yl)ethenyl]phenyl]phosphanide into its molecular formula.
user
C31H21CsNPS
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