You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (5E)-5-[(E)-2-(1-methyl-3a,8,9,10,11,11c-hexahydro-3H-pyrazolo[4,3-a]phenanthridin-7-yl)but-2-enylidene]-4H-1,3-thiazol-2-amine .
user
C22H25N5S
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