You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3R)-7-[5-chloro-2-[(2-methylpyrazol-3-yl)amino]pyridin-4-yl]-2-(2,3-dihydro-1,4-benzodioxin-5-ylmethyl)-3-(methoxymethyl)-3,4-dihydropyrrolo[1,2-a]pyrazin-1-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C27H27ClN6O4
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