You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (2S)-2-[[5-chloro-2-[[1-(2-hydroxyethyl)pyrazol-4-yl]amino]pyrimidin-4-yl]amino]-1-(cyclopentylamino)-2-phenylethanol ?
user
C22H28ClN7O2
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