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 (2R,5R,6R)-5-(1-cyclohexylpyrrol-3-yl)-2-methyl-6-pyridin-2-yl-2,3,5,6-tetrahydroimidazo[2,1-b][1,3]thiazole .
user
C21H26N4S
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