You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 4-[4-[[(E,2R)-3-ethenylpent-3-en-2-yl]amino]-7H-pyrrolo[2,3-d]pyrimidin-6-yl]-3-methoxybenzamide into its molecular formula.
user
C21H23N5O2
assistant